Chapter-7 Ventilation

VENTILATION
၇.၁ (Indoor Air Quality [IAQ]) 7-1
၇.၁.၁ (Causes of Poor IAQ) 7-1
၇.၁.၂ (IAQ Control Methods) 7-2
၇.၁.၃ (IAQ Factors) 7-2
၇.၁.၄ (CO2 Levels) (IAQ) 7-2
၇.၂ (Natural Ventilation) 7-3
၇.၂.၁ Stack Effect 7-4
၇.၂.၂ (Design Information) 7-6
၇.၂.၃ Design outputs 7-6
၇.၂.၄ (Calculation Approach) 7-7
၇.၂.၅ Design Watch Points 7-7
၇.၃ Mechanical Ventilation 7-8
၇.၃.၁ 7-8
၇.၄ Hospital Operation Room Ventilation 7-8
၇.၄.၁ Ceiling Construction 7-12
၇.၅ (essential rooms) MV System 7-13
၇.၅.၁ ( (Exit Staircase Internal Passageway) 7-14
၇.၅.၂ ( ) Smoke stop lobby 7-17
၇.၅.၃ (ဂ) Fire Command Center (FCC Room) 7-18
၇.၅.၄ (ဃ) Smoke Stop Lobby Fire Fighting Lobby 7-20
၇.၅.၅ ( ) Fire Pump Room (Generator Room) 7-22
၇.၅.၆ ( ) Flammable and Explosive Substances Rooms 7-24
၇.၅.၇ ( ) (Kitchen) 7-24
၇.၆ Air handling systems mechanical ventilation 7-30
၇.၆.၁ Smoke Tripping of AHU 7-31
၇.၇ Engineered Smoke Control System - Design Consideration and Over View 7-33
၇.၇.၁ Designed Fire Size 7-35
၇.၇.၂ Smoke Extraction System 7-39
၇.၈ Basement Car Park Carbon Monoxide Monitoring and Ventilation Fan Control System 7-42
၇.၈.၁ Safe Level of (CO) 7-43
၇.၈.၂ Understanding of basement car park Mechanical Ventilation System Design 7-44
၇.၈.၃ Basement Car Park Carbon Monoxide Monitoring System's Design Consideration 7-46
၇.၈.၄ (CO) Sensor 7-47
၇.၈.၅ Control Strategies 7-48
၇.၈.၆ (Energy Saving) 7-49
၇.၉ Mechanical Smoke Purging System for Basement Car Park 7-50
၇.၁၀ (Outdoor Air Requirement) 7-51
၇.၁၀.၁ ASHRAE Standard 62.1 - 2004 (Minimum Ventilation Rates ) 7-52
၇.၁၁ Supply Air Rate 7-55
၇.၁၁.၁ (Outdoor Air Intake) 7-57
၇.၁၂ Contamination 7-58
၇.၁၂.၁ 7-58
၇.၁၂.၂ Return Air, Transfer Air Exhaust Air 7-58
၇.၁၃ Exhaust Air 7-61
၇.၁၃.၁ Toilet Ventilation Rates 7-61
၇.၁၃.၂ Minimum Exhaust Rates 7-61
၇.၁၃.၃ Exhaust Air Rates and Pressure Relationship 7-62

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

Chapter-7 Ventilation
ဂ
ဂ
(၁၀) ဂ

၇.၁ (Indoor Air Quality [IAQ])

(air quality)
National Environment Agency(NEA) guidelines
(test parameters) (chemical)
(biological)
(physical)
Test Parameters ႊThreshold Limits
(၁) Temperature (Degree Celsius) 22.5 – 25.5
(၂) Relative Humidity (%) < 70
(၃) Air Velocity (m/s) / Air Flow <0.25
(၄) Carbon Monoxide (ppm) 9
(၅) Carbon Dioxide (ppm) 1000
(၆) Ozone (ppm) 0.05
(၇) Total Volatile Organic Compounds (ppm) 3
(၈) Respirable Suspended Particulate (/m3) 150
(၉) Formaldehyde (ppm) 0.1
(၁၀) Total Bacteria Count – TSA, 35 Degree Celsius 48 Hours (cfu/m3) 500
(၁၁) Total Fungi Count – PDA, 25 Degree Celsius 5 Days (cfu/m3) 500
(temperature) Relative Humidity(%) (air velocity)

၇.၁.၁ (Causes of Poor IAQ)

(IAQ problems) ၅၀%
(၁)
(i
(၂) (poor intake/exhaust locations)
(၃) (inadequate filtration or dirty
filters.)
(၄) Intermittent airflow
(၅) (poor air distribution.)
(၆) (inadequate operation)
(၇) (inadequate maintenance)

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 Chapter-7 Ventilation

၇.၁.၂ (IAQ Control Methods)

(၁) (control temperature and
humidity)
(၂)
(ventilation - dilution)
(၃) (remove pollution source.)
(၄) (filtration)

၇.၁.၃ (IAQ Factors)

(air quality)

(၁) (thermal environment)

(၂) (smoke)
(၃) (odors)
(၄) (irritants dust)
(၅) Stress problems (perceptible, nonperceptible)
(၆) (toxic gases carbon monoxide, carbon dioxide)
(၇) (allergens pollen)
(၈) (biological contaminants - bacteria mold
pathogens legionella micro organisms fungi )

၇.၁.၄ (CO2 Levels) (IAQ)

၇.၄ (CO2 Levels)
(၁) (CO2 Levels) 350 PPM
(Outdoor background level: 350 PPM CO2 avg.)
(၂) ASHRAE Standard 62 (CO2 Levels) 1000 PPM

(ASHRAE Standard 62 recommends: 1000 PPM CO 2 max.)

(၃) OSHA and U.S. Air Force standard (CO2 Levels) 650 PPM

(OSHA and U.S. Air Force standard: 650 PPM CO 2 max.)

(၄) (CO2 Levels) 800–1000 PPM

(Human discomfort begins: 800–1000 PPM CO2.)

(၅) (CO2 Levels) 12,000 PPM ဂ

(Long term health effects: >12,000 PPM CO2.)

၏
( ) (remove heat)

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

( ) ၲ (CO)
(CO₂) (contaminant)
(ဂ) (acceptable indoor air quality)

(outdoor air)

“ Vent ”
“M h ”
(naturally
ventilated)
(mechanical ventilated) air c

(mechanically
ventilated space) air con
(naturally ventilated space)

Air c
(smoking
room)
(code)

(naturally ventilated)
(occupied space)
h h
(As-built drawing) (maintenance)
(trouble shooting)

၇.၂ (Natural Ventilation)

၇-၁ Use of Wind pressure on building ၇-၂ Venturi effect

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 Chapter-7 Ventilation

Principle of Natural Ventilation

(natural ventilation)

(၁) Wind pressure on building

(၂) Venturi effect
(၃) Chimney effect
(၄) Stack effect

၇-၃ Atrium chimnery

၇-၄ Stack driven natural ventilation ၇-၅ Wind driven natural ventilation
၇.၂.၁ Stack Effect
(inside temperature)
(outside temperature) ( “S k E ”
natural ventilation Non-mechanical airflow ၌
( “Stack Effect”

(inside) (outside)
(air densities)

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

(air densities) (pressure

differ
“ ”
stack effect
ျပ (wind pressure k
ဤအခန္းတြင္ မပါဝင္ေပ။ ထုိအေၾကာင္းကို CIBSE AM 10 Natural ventilation in non-domestic buildings

(air movement)
(temperatures difference ventilation
application stack effect

S k (air movement)
၌ (inlet point) (air outlet point)

(inlet point) (air outlet point)

(vertical distance) stack effect

(direction of air flow)

(inside temperature) (outside temperature)

၌ (air flow) (upwards direction)

ဤ (air flow

(internal temperature)
၌
(airflow) (downwards direction)
ဤ (air flow

(machine enclosure)
“Stack Effect”
(tall enclosure)
k (airflow
(internal temperature)
(acceptable operating condition)

CIBSE guide A chapter 4 standard calculations(

(airflow) ) (wind pressure)
(၄)[chapter-4]
(more complex arrangement of opening layouts)
CIBSE publication AM10 Natural ventilation in non-domestic buildings 2005

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 Chapter-7 Ventilation

“S kE ”
(၁) “Stack Effect” (air flow
(does not rely on wind)
(၂) (air flow) (stable air flow)
(၃) (greater control in
choosing areas of air intake)
(၄) (sustainable method)

“S kE ”
(၁) (lower magnitude)
(၂) (relies on temperature difference)
(၃)
(design restrictions)
(၄)

၇.၂.၂ (Design Information)

( ) (type) (size) (location
of openings)
( ) (opening) (type) ႑ (shape)
(airflow)

၇.၂.၃ (Key Design Inputs)

( ) (inside air temperatures) (outside air temperatures)
(° (difference between
inside and outside temperatures) (density) (pressure)
(pressure) k
( ) (height difference between inlet and
outlet) (meter
stack effect

၇.၂.၃ Design outputs

Cross ventilation single-sided ventilation ventilation (type)
schedule of window types actuators control schedule of transfer grilles
ventilation strategy specification
• Ventilation performance
• solar shading
• (air flow paths) l

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

• control philosophy

၇.၂.၄ (Calculation Approach)

(၁) (Building layout) ႊ

(၂) (inside temperature) (outside air temperature)

(weather data)
(၃) (height difference between the inlet
and outlet points) Centre to
(၄) (type) (size) ႑ (shape)

(၅) (volume flow rate)

(values)

၇.၂.၅ Design Watch Points

( ) (direction of air flow) (outside temperature)
(outside temperature)
(air flow direction) (outside
temperature
( ) S k (airflow)
(design airflow patterns)

(ဂ) S k natural ventilation

(ဃ)
Stack effect
References for Natural Ventilation

 CIBSE Guide A, Environmental Design, 2006, ISBN 1 903287 66 9

 CIBSE, Natural Ventilation in Non-Domestic Buildings, AM10, 2005, ISBN 1 903287 56 1
 AIVC 1998, TN 44 Numerical Data for Air Infiltration & Natural Ventilation Calculations,
ISBN 1946075972
Natural Ventilation Guidelines:

 Whole Building Design Guide, National Institute of Building Sciences

http://www.wbdg.org/resources/naturalventilation.php
 "Natural Ventilation for Infection Control in Health-Care Settings," a report (including design guidelines)
by World Health Organization for naturally ventilated health-care facilities.
http://whqlibdoc.who.int/publications/2009/9789241547857_eng.pdf
Natural Ventilation
 The Center for the Built Environment (CBE), University of California, Berkeley.
( http://www.cbe.berkeley.edu)
 Lawrence Berkeley National Laboratory, Berkeley, California. ( http://www.lbl.gov)

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 Chapter-7 Ventilation

 Department of Architecture, Massachusetts Institute of Technology.

(http://architecture.mit.edu/building-technology/program/research-topics)

၇.၃ Mechanical Ventilation

Mechanical Ventilation System MV System
(bathroom) (toilet)
(locker room) (similar facility)
(natural ventilation
(mechanical ventilation)
(outdoor air) ventilation duct Air condition unit

naturally ventilated
(louver) Exhaust air
(replacement air) (exhaust air)

၇.၃.၁

၇-၆ Supply air exhaust air ၇-၇ Supply air exhaust air
“ ressure” “
Pressure”

၇-၈ Mixing (Dilution) Ventilation ၇-၉ Displacement ventilation

၇.၄ Hospital Operation Room Ventilation

air distribution system shopping center air
distribution system ဂ

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

air distribution system supply air

supply air room air (mix)
(uniform temperature zone) air
distribution system
(airborne contaminant)
air distribution system
(thermal comfort (airborne contaminant)
(airborne contaminant)
ဂ (post-operative infection) infection

ဂ
(particles) ventilation system
High Efficiency Particulate Filter(HEPA) ႊ
(infiltration )

Airborne contaminant
(၁) micro-organism( )
(၂) Ventilation infiltration (particles)
(contamination)
Air distribution system (operation room)၌
(contamination) System
(airborne contaminant ) (isolate)
supply air (mixing)

(fresh air)

၇-၁၀ Operation Room Ventilation

(fresh air ventilation rate) cooling load (latent
heat load sensible heat load) Airborne contaminant
(effective) (operation room)
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 Chapter-7 Ventilation

supply air (low uniform velocity)

stable downward air flow “Lamina Flow System”
Lamina flow ventilation system (ceiling) lamina flow diffuser
(uniform velocity lamina air flow
pattern (air change rate)
(air change rate (energy consumption)
(energy cost)

(energy consumption) lamina air flow

(critical zone (operation table)
(air change rate)
lamina flow diffuser
(operation table) Lamina flow diffuser
(low face velocity) diffuser
h

Supply air (temperature differential)

supply air discharge air envelope
diffuser (clean zone)
Lamina flow diffuser

Lamina flow ventilation system supply air HEPA filter(High

Efficiency Particulate Air Filter) HEPA filter Lamina flow
ventilation system HEPA filter (operation
room) (filter)
sterilized Diffuser
HEPA filter
sterile

၇-၁၁ Laminar Flow - Full Ceiling Supply ၇-၁၂ Laminar Flow - Partial Ceiling Supply

clean zone (operation table)

“Full Ceiling Lamina Flow Ventilation System”

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

(operating table) lamina f

(air curtain (energy)

Air curtain linear slot diffuser (operation table)

(air curtain) Linear slot diffuser
(operating table) (၃
(clean zone) (operating
table) (၃ Linear air diffuser supply air
(vertical line) (၁၅) ဂ
(၁၅) ဂ supply air (operation table)
(barrier)

၇-၁၃ An integrated system of laminar flow and linear slot diffusers that minimizes mixing of
room and supply air to create a controlled operating room work area.

Contaminated room air (outer boundary layer)

(operating table) (exhaust grille)
contaminated room air
(dilution) d

Supply air ၆၅% ၇၅% Lamina flow air diffuser ၂၅%

၃၅% air curtain (discharge)
“ ”
positive pressure
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 Chapter-7 Ventilation

(supply air volume) (return air volume)

(supply air volume)
(return air volume)
(return air volume) (supply air volume)
၈၅%

Return air grille (၃) (၆)

exhaust return air grille (low level)
contaminated air (gas)

return air grille

return air grille grille
grille
contaminated air (operating table)

၇.၄.၁ Ceiling Construction

(ceiling) air distribution system
Supply air (pressurization)
(ceiling) plenum box

( ) Dry wall ceiling

( ) Gasket T-bar ceiling
(ဂ) -

air conditioning system

(comfort ဂ
(supply air) (temperature
control) (air flow rate)
(control) (air flow
rate) (control)

(temperature gradient)
(air movement)
(temperature distribution) h
(high contaminated area) (air
velocity) (၀.၂) (0.2 m/s)
(patient room) (၀.၁) (0.1 m/s) (air

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

velocity) (air velocity) 0.45 ± 0.10 m/s unidirectional

lamina flow pattern

(Air Change per Hour(ACH))

(patient room)
2 ACH – 6 ACH Critical room
(၁၂) (12 ACH) (surgical operating theatre) 15 ACH
25 ACH

၇.၅ (essential rooms) MV System

၌
ဂ ဃ

(fire protection) Mechanical &

Electrical (M&E) s ႊ (code
of practice)

၇-၁၄ Escape routes and rescue routres ၇-၁၅ ဂ

M M ဂ (fire
protection) h
ဂ ဂ
၂၁ M M ဂ
ဂ mechanical ventilation s

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 Chapter-7 Ventilation

(essential area/rooms)
mechanical ventilation system
( ) (exit staircase) internal passageway
)
( ) Smoke stop lobby (
)
(ဂ) Generator room ( )
(ဃ) Fire Command Center(FCC) (
)
( ) Fire pump room ( )
( ) Rooms involving use of flammable and explosive substances(
)
( ) Kitchen ( )

၇.၅.၁ ( (Exit Staircase Internal Passageway)

Mechanical ventilation s
) )

၇-၁၆ Smoke stop lobby ၇-၁၇ Smoke stop lobby (pressurized space)

stack eff

(temperature differences) (pressure difference) “Stack Effect”

Buoyancy f

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

(stairwell) elevator shafts/refuse chute

၌
ႊ (heat
energy) (expansion force

(exit passage way

(emergency exit)
(pressure

(emergency exit)
(exit passage way) f duct
control p (independent system)
fan duct
(

(o
s (intake point)
(exhaust opening) ၅

(emergency exit) exit

p
supply a (g ) (discharge)
duct (fire rated
construction) (fire rated b duct (enclosed)

(fire rated b duct (enclosed)

duct

supply air) duct fire damper

F
fire damper (isolation)
staricase p
(isolate)
(emergency exit) exit
passage way f
Staricase pressurization fan over load

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 Chapter-7 Ventilation

p (၂၄)
(natural ventilation)
(exit staircase) (pressurized)

(fire fighting lobby)

(fire fighting lobby) (pressurized)

၇-၁၈ Maintaining pressure differential ၇-၁၉ Pressure gradient

၇-၂၀
(Pressurization Level)
Pressurized exit staircase (occupied
area) 50 p
(pressurized exit staircase) k -

smoke-stop
S k -
(occupied area)

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

Pressurized exit staircase

(air flow) (၇-၁၀)

main
discharge
(velocity) h .
၌

၇.၅.၂ ( ) Smoke stop lobby

( )
Smok - smoke-f S k -
(exit staircase)
(exit staircase) user occupied a ၌
(user occupied area)
User occupied a
(exit staircase)
(smoke stop lobby)
S k -
(exit
staircase)
User occupied a

(pressurized air)

၇-၂၁ Smoke-stop lobby Fired Rated Duct

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 Chapter-7 Ventilation

S k -
(exit staircase) smoke-s (s
s (intake point)
(exhaust opening) ၅

၇.၅.၃ (ဂ) Fire Command Center (FCC Room)

Fire Command Center (FCC Room)

PA system (Public Address

System) S S S B S
c panel

၇-၂၂ ၂၄ smoke stop lobby

staircase pressurization f

(staircase pressurization fan) local

panel panel remote panel
main alarm panel staircase
pressurization f

(indication light

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

FCC r staircase pressurization f

Staircase
local panel
remote panel
Main Alarm
staircase pressurization fan
h

၇-၂၃ Smoke stop lobby

(s s (intake
point ) (exhaust opening) ၅
Fire Command Center(FCC) f duct
control p (i ) supply
f

Fire Command Center (FCC) r duct

duct (FCC r fire rating
r )
(enclosed)
(fire rated board) duct (enclosed)
duct exhaust

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 Chapter-7 Ventilation

duct fire d duct

Fire Command Center (FCC) room

၇-၂၄ E mechanical ventilation

၇.၅.၄ (ဃ) Smoke Stop L Fire Fighting Lobby

Smoke-st h mechanical ventilation s

M

Building f (supply air) - h h

smoke-stop l fire fighting l - h h
(၁၀
(s s (intake point)
(exhaust opening) ၅

- h

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

၇-၂၅ Staircase fan and supply air duct

၇-၂၆ Mechanical ventilation of somke stop lobbies and fire fighting lobbise

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 Chapter-7 Ventilation

၇-၂၇ G
၇.၅.၅ ( ) Fire Pump Room (Generator Room)
( ) (fire pump)
f

( ) (emergency exit (escape

emergency g
(generator room)

၇-၂၈ Fire pump r G

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

(s s
(intake point) (exhaust
openings) ၅

(generator room) duct

(enclosed) (fire rated board)

duct (enclosed) duct
fire d

၇-၂၉ Fire pump room Generator room and fire command center (FCC) room

၇-၃၀ Room with Flammable vapour

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 Chapter-7 Ventilation

၇-၃၁ E
duct (fire pump room)
(generator room)

၇.၅.၆ ( ) Flammable and Explosive Substances Rooms

( )

- h h
- h h ၂၀

(exhaust air) (discharge)

h (intake opening) (၅

duct
(fire rating) (fire rating)
(fire rated) (fire rating)
(fire rating)
h ၌
duct

၇.၅.၇ ( ) (Kitchen)

Mechanical kitchen
kitchen ၏ (volume) (၂၀ (20 air change)
kitchen hood (in
operation) kitchen hood (exhaust air)

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

Kitchen Exhaust
Kitchen exhaust hood cooking process
(grease-laden vapour)
(grease removal devices)
Fire suppression equipment (roof)
(building surface) Exhaust air (discharge)

၇-၃၂ Kitchen exhaust system

(cooking area)
(kitchen) mechanical exhaust system
exhaust system Fan duct
system
(exhaust air)
(make up air) Kitchen hood (in operation)
(kitchen area)
Kitchen exhaust hood ၏ exhaust flow rate Q [m³/s] (formula)
(kitchen hood h

V = Capture velocity which shall not be less than 0.30 m³/s for commercial type kitchens
L = Length of cooking surface, m
W = Width of cooking surface, m
H = Distance of hood to emitting surface, m
F = 1.0 For heavy duty high temperature kitchen
F = 0.7 for light duty, medium and low temperature cooking with equipment such as ovens,
steamer, ranges, griddles and fryers.

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 Chapter-7 Ventilation

၍ (wall mounted) hoods island type hood

Design Consideration
Kitchen hood kitchen exhaust duct
(unprotected combustible materials) 500 mm

Exhaust air ၏ habitable areas

(discharge) k
(၅) (discharge)

Kitchen exhaust duct kitchen

duct (enclosed) kitchen ၏
(fire rating) ၏ (fire rating)
(fire rating) fire rated duct Duct ၏
(internal) (external) (fire rated) Duct
rise h (enclosed) kitchen duct duct
service ၏ installation compartmentalized

Kitchen duct fire damper

Duct
Kitchen exhaust duct shaft effluent air
၍ ႊ
Kitchen duct
( ) (၁.၂) mild steel (mild steel of thickness
not less than 1.2 mm)
( ) (၀.၉) stainless steel Stainless steel of
thickness not less than 0.9 mm
(ဂ) (other approved material)

Kitchen duct ၏ (opening)

Kitchen duct ၏ (run of ducting)
၏ drain

Exhaust hoods
(cooking vapor emission)
kitchen hood exhaust air (velocity) 0.15 m³/s Kitchen exhaust
(hard-faced) mild steel stainless steel
aluminum

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

Seam liquid-tight seam (joint) fusion welding

lopping riveting soldering approved

Hood (washable grease filter)

filter filter ၏
(air leakage)

Hood ၏ (internal surface) ၄၀

filter ၏ (face of filter) (vertical) ၃၀
Grease filter ၏ (pressure drop)
assess

Canopy Type Hoods

Canopy hood ၏ (lower edge) (cooking surface)
၏ (၁.၂) (၂.၀)
Hood 150 mm
appliance
Minimum CFM per Lineal Foot of Hood
Type of Hood Type of Cooking Appliances
Extra-Heavy Duty Heavy Duty Medium Duty Light Duty
Wall-Mounted Canopy 550 400 300 200
Single Island Canopy 700 600 500 400
Double Island Canopy
550 400 300 250
(per side)
Backshelf/Pass-Over Not permitted 400 300 250
Eyebrow Not permitted Not permitted 250 250

Application Factor (CFM/in ft.)

Kitchen Types Velocity
Light duty (no grease, light grease) 150-250 CFM/ft
Medium duty (fryers and griddles) 250-350 CFM/ft
Heavy duty (heavy grease, charbroiler) 350+ CFM/ft

Application Updraft velocity factor

Steam kettles, ranges, ovens, non-grease producing equipment 50 fpm
Fryers/griddles, grease Producing equipment 85 fpm
Charbroilers, high heat and grease producing equipment 150 fpm

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 Chapter-7 Ventilation

၇-၃၃ central island hood

၇-၃၄ corner hung hood ၇-၃၅ wall hung hood

၇-၃၆ Canopy hoods ၇-၃၇ Eye brown hood

( ႊ k h
Kitchen h kitchen e h
(၅၀၀) (500mm)
k ၅၀၀
(500mm)
(Mounting heights and overhang requirements)
Mounting End Front Rear
Type of Hood
Height Overhang Overhang Overhang
Wall-Mounted Canopy 78" 6" 6" N/A
Single Island Canopy 78" 6" 6" 6"
Double Island Canopy 78" 6" 6" N/A
Eyebrow 78" N/A 6" N/A
Backshelf/Pass-over 24" 6" 10" N/A

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

Hood exhaust

Minimum Exhaust Flow Rate (CFM/Lineal Foot of Hood Length)

Type of Hood
Light Duty Medium Duty Heavy Duty Extra-Heavy Duty
Wall-Mounted Canopy 200 300 400 550
Single Island Canopy 400 500 600 700
Double Island Canopy 250 300 400 550
Eyebrow 250 250 Not Permitted Not Permitted
Backshelf/Pass-over 300 300 400 Not Permitted
Notes:
(၁) h k h Gas and electric ovens (standard, bake, roasting,
revolving, retherm, convection, combination convection/steamer, conveyor, deck or deck
style pizza and pastry ovens, electric and gas st – k k

(၂) Medium duty k h open deep fat fryers, donut fryers, kettle fryers,
and pressure fryers), electric and gas pasta cookers, electric and gas conveyor (pizza)
ovens
(၃) Heavy duty k h electric and gas underfired broilers, electric and
gas chain (conveyor) broilers, gas open burner ranges (with or without oven), electric and
gas wok ranges, electric and gas overfired (upright) broilers, and salamanders

(၄) Extra-heavy duty k h (charcoal solid

fuel

၇-၃၈ Kitchen hood p

K h kitchen h
(fire rated board K h h
fire damper
h
(

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 Chapter-7 Ventilation

၇-၃၉ Kitchen Exhaust Ducts

Kitchen Exhaust Hoods

Kitchen exhaust hood air flow 2.5 m³/s makeup air
makeup air exhaust air
၅၀ mechanical

Fume Hoods
fume hood system 7.5 m³/s feature

(၁) variable air volume hood exhaust Design exhaust air volume ၅၀%

(၂) exhaust air 75% k direct make up air

room set point 2°C Re-heating
(၃) Heat recovery energy recovery ( make up air

၇.၆ Air handling systems mechanical ventilation

System pressurisation systems of exit staircases and internal corridors smoke
control systems outdoor air intake Opening (၅)
(exhaust discharge opening)
Outdoor air intakes (kitchens, toilets, car parks, cooling
towers, laundries, rubbish dumps or plant rooms ) exhaust discharge
၅
Outdoor air intakes insect screen

Screening wire mesh

10 mm mesh Cooling towers
(water droplets) outdoor air intakes

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

Return air opening outdoor air intake opening

(lighted matches) (cigarette butts)
(filter media)
h
Air con (outdoor air intakes)
(outside floor level) 2.1 m

(toilets)
(domestic kitchens) exhaust duct duct system
(connect) ( h h )
(connect) fan

(device) (industrial)
(commercial kitchens) exhaust duct duct
(separate system)
Exhaust duct (outdoors) discharge
exhaust air (pedestrians)
(outside floor level) 2.1

၇-၄၀ Fire compartment ( )

၇.၆.၁ Smoke Tripping of AHU

(isolate)
duct
duct fire damper
( )
( )

(Air Flow rate) 15,000 m3 h

( 15, h )fire damper
(authority)
s k

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 Chapter-7 Ventilation

( ) (air flow rate) 15,000 m3 h

( )
(ဂ)
(ဃ)
return air stream ၌ s k

၇-၄၁ Air Handling Unit(AHU) and duct work

၇-၄၂ k
၇.၆.၂ S k
Probe k
h h s

Activation of smoke detector

Return air s
smoke detec
a
t
၇-၄၃ Probe type smoke detector Smoke detector
S k
k s building fire alram s
Building Automation System(BAS)

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

၇.၇ Engineered Smoke Control System - Design Consideration and Over View

“Engineered Smoke Control System”

၇-၄၄
Engineered smoke control system
Engineered smoke control system M E
Air Conditioning and Mechanical Ventilation (ACMV) S
M ဂ

Engineered smoke control system

၇-၄၅

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 Chapter-7 Ventilation

A ventilation system
- k

(၁) (perimeter of the fire.)

(၂) (temperature of the flames in the plume.)
(၃) (effective height of the column of hot)

square root of the absolute h

(၁)
burning rate of 0.5 MW/m2 10 m2
h 2.6 M
(temperature) (277°C at 5MW. )
Effect of spreading and growing fires on smoke temperature
Constant burn rate at 0.5 MW/m2 Growing fire
Time from ignition Fire size Max. Fire size
Heat output 2
Heat output Max. smoke
(minutes) (m ) smoke (m2)
(MW) (MW) temp (C)
temp (°C)
- 0.3 0.6 80 0.1 0.4 43
8.0 1.2 2.4 144 0.4 1.5 66
16.0 5.0 10.0 277 1.5 6.0 118
18.5 8.5 17.0 356 2.6 10.0 152
20.0 10.0 20.0 384 3.0 12.0 159
22.0 _ - - 4.6 18.0 195
22.5 - - - 5.0 20.0 201

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

k (unsprinkled
2
fire M 20 m
engineered smoke control s
(designed fire s
engineered smoke control system

B
(၁၉၀၀) ( k ) engineered
smoke control system ၁၉၀၀
၅၀၀
a engineered smoke control system

၇-၄၆ Atrium smoke control system

Engineered smoke control system sprinkler fire
protection s Engineered smoke control system

၇.၇.၁ Designed Fire Size

(Fire Size)
Occupancy (Sprinklered) Heat Output(MW) Perimeter of Fire(m)
Shops Q = 5.0 P = 12.0
Offices Q = 1.0 P = 14.0
Hotel Guest Room Q = 0.5 P = 6.0
Hotel Public Areas Q = 2.5 P = 12.0
Assembly Occupancy with fixed seating Q = 2.5 P = 12.0
Q = the heat carried by the smoke in P = the perimeter of the fire in meters
System to handle worst case scenario

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 Chapter-7 Ventilation

Minimum clear height below smoke layer = 2.5 m

• BR 186 – Design principles for smoke ventilation in enclosed shopping centre

• BR 258 – Design approaches for smoke control in atrium buildings

၇-၄၇ (Fire Size)

Sprinklers (Fire Size)
Retail Stores Standard 12 metres x 5 megawatts
Fast Response 9 metres x 2.5 megawatts
Open Plan Offices Standard 14 metres x 2.7 megawatts
Hotel Bedroom Standard 6 metres x 4 megawatts
Motor Car (BRE 368) Non 12 metres x 3 megawatts
Motor Car (BS7346-Pt 7) Non 20 metres x 8 megawatts
Standard 14 metres x 4 megawatts
Ladened Lorry 20 metres x 7 megawatts

၇-၄၇ Atrium smoke control system

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

၇-၄၉ Atrium smoke extraction system

၇-၅၀ Atrium smoke extraction system

၇-၅၁ Smoke layer

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 Chapter-7 Ventilation

၇-၅၂ Smoke layer and smoke extraction or venting

၇-၅၃ Smoke curtain and perforated false ceiling

၇-၅၄ Fire rated duct and standby fans

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

၇-၅၅ Smoke Extraction System

၇.၇.၂ Smoke Extraction System

shopping m “Smoke Extraction System”
k (upper floors “
” ) ) ၅
၃.၅

၁၂၀၀ ၁၂၀၀ f
[Floor area = 1,200 m2 typical(1 fire zone)]
(၂၀ (၁၀)
(Atrium void= 20m long x 10m wide(200 m2))

smoke extraction s
(design f
(design f
၁၂
(၅၀၀၀ k
(3m x 3m sprinkler controlled, 12m perimeter, 5,000kW convective heat output)

)
၂.၂
(၁၇.၀၆)
(Inlet: 4 nos. twin leaf sliding doors, size 2.2m wide x 2m high, Total area = 17.60m2)

၃ “Design Clear
H h“

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 Chapter-7 Ventilation

Design Clear High : 3m above finished floor level

Max. mass flow Mf = 175 kg/s
Min. smoke layer temperature above ambient T = 18 °C
Max. replacement air velocity, V = 5.0 m/s
(၁) (Calculate height of atrium, H)
H = 1st ~ 5th Storey
= 5.00m + 4(3.50)m
= 19.0m
(၂) smoke layer (Calculate smoke layer depth, dB)
dB = H – clear ht. below smoke layer(assumed 3m)
= 19.00 – 3.00m
= 16.0m
(၃) (mass flow of smoke, Mf (based on entrained
plume))

M = the mass rate of the smoke produced

P= the perimeter of the fire (meter)
Y= the height of the smoke layer (meter)

= 11.85 x 2
= 23.70 kg/sec ( (၂၃.၇) ဂ )
(၄) ၌ (initial temperature)
initial temperature (I . k =θ )

= 5000 /(23.7 x 1.01)

= 208.88 °C (say 209°C)

the temperature of the smoke in C above ambient

the heat heat carried by the smoke in kW
the mass rate of smoke production in kg/s
(၅) Sprinkler ( sprinkler
(၆၈) ဂ ဂ
)
Sprinkler operating temperature θ

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

(၆) Sprinkler θ (smoke

layer Sp k k θ

= ½(209 + 68)
= 138.5°C > 18°C >> OK
(၇) (Absolute ambient temperature, To)
To = 300 °K (27 °C)
(၈) k temperature (Absolute temperature of smoke layer,Tcm)

= 300 + 138.5
= 438.5 °K
(၉) -(volume of smoke produce, Vp)

= 28.43m3
=add 20% safety factor
= 28.43m3 x 1.2
=34.12 m3/s
၃၄.၁၂
(၁၀) k
(Proposed smoke extraction rate, Ve)
၁၂ fan

Ve = 3 duty fans + 1 standby fan (each 12 m3/s)

= 3 x 12 m3/s
= 36 m3/s > 34.12 m3/s >> OK
(၁၁) ၁၂ fan

(air opening) (Nett Inlet air opening required, Ai)-

(၅)

= 34.12 / 5.0
= 6.82 m2

(၁၂)

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 Chapter-7 Ventilation

(Check Inlet Area Opening Available, Am)

Am = 4 pair sliding doors
= 4 x 2.2m x 2.0m
= 17.60 m2 > 6.82 m2 >> OK
k
air openi )

၇-၅၆ Smoke Extraction System

၇.၈ Basement Car Park Carbon Monoxide Monitoring and Ventilation Fan Control System
(basement car park)
h mechanical ventilation s
ဂ (internal combustion)
h basement car p k ၌
(exhaust gas)

ဂ ၌

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

၇-၆၇
(exhaust gas) ဂ
ဂ
(complete combustion) e h

( (CO)
(CO)
(CO) ဂ
(oxygen atom) (carbon atom)
(CO) ႊ (emissions)
( )

၇.၈.၁ Safe Level of (CO)

(CO) M

(CO) level PPM part pe

(CO) (၃၀) 30PPM Level

(CO) 9PPM Level
(CO) (၁၀) ဂ
(CO) 10PPM l
( )

(CO) (level)

Concentration (ppm) Carbon Monoxide Time (hours)

50 Allowed exposure level 8
200 Slight headache. sensation of uneasiness 3
400 Headache. sensation of uneasiness 2
600 Headache, sensation of uneasiness 1
1000...2000 Confusion, headache, nausea 1,5
1000...2000 Balance loss tendency 0.5
2000...2500 Unconsciousness 0.5
4000 Fatal <1

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 Chapter-7 Ventilation

CO PPM (Time) Symptoms

Maximum exposure allowed by OSHA in the workplace over an

35 PPM 8 hours
eight hour period.
200 PPM 2-3 hours Mild headache, fatigue, nausea and dizziness.
Serious headache- other symptoms intensify.
400 PPM 1-2 hours
Life threatening after 3 hours.
Dizziness, nausea and convulsions. Unconscious within 2
800 PPM 45 minutes
hours. Death within 2-3 hours.
1600 PPM 20 minutes Headache, dizziness and nausea. Death within1 hour.
3200 PPM 5-10 minutes Headache, dizziness and nausea. Death within 1 hour.
6400 PPM 1-2 minutes Headache, dizziness and nausea. Death within 25-30 minutes.
12,800 PPM 1-3 minutes Death.
Singpore Standard 554: I
(recommended) (CO) (level 9 M

၇.၈.၂ Understanding of basement car park Mechanical Ventilation System Design

Basement car park monitoring s
basement car park mechanical ventilation s
basement car park mechanical ventilation
s (CO) s (CO)
MV fan (CO)
MV fan

Car park
(carbon monoxide)
(other combustion products)
ventilation
Natural ventilation ၍ car k
exhaust air mechanical ventilation
system system (car park)
(outdoor air)
(car park)
(low occupancy) 25
ppm (ventilation rate)
Residential parking area 25 ppm
averaged over an hour period Ventilation fan (switch off)

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

Car park ventilation supply air (part) exhaust air (part) ၍ ႏွစ္မ်ိဳး
ရွိသည္။ Exhaust air ၏ ၅၀% (high level) Exhaust air ၅၀%
(low level)
Low level (exhaust air grille)၏
(finished floor) 650 mm
Supply air intake ၏ (exhaust discharge opening)
(၅)
Car park Supply air outlet

Car park exhaust air (discharge (air intake

opening) (doorway) (၅) (exhaust
air)

(exhaust air)

(Aboveground car park)

(aboveground car park)
smoke purging system code of practice for fire precaution in
building
Aboveground car park (opening)
(၁၂) (12m) natural ventilation
(openings) ၁၅%

Natural Ventilation Mechanical Ventilation ၍

( ) S
( ) Exhaust air system . h h
(ဂ) (extraction point) low level Exhaust grille ၏
(finished floor) 650 mm
Natural ventilation (openings) h
၂% supply part

(Basement Car Park)

(basement car park)
mechanical ventilation system (supply air volume
rate) (exhaust air volume rate)
car park
car park noxious gases

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 Chapter-7 Ventilation

(design requirement)
( ) Fan (b k air flow capacity
(run) Car park
(break down)
( ) Duct section k
(ဂ) Duct section (operate) control
(in the event of failure)
section
(ဃ) Exhaust air supply air interlock Exhaust air
supply air (shutdown) Supply air (
) exhaust air (shutdown)
( ) Exhaust supply principle source electrical supply
(Emergy
g (power cable) )
basement car park
(intermixing )

၇.၈.၃ Basement Car Park Carbon Monoxide Monitoring System's Design Consideration
basement car p k (zone) supply fan exhaust fan
(zone) exhaust fan

C k s h
s exhaust air flow rate

၇- ၅၈ duct (basement car park duct)

B k h S S
SS

h )

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

Singapore Standard 554 I Singapore Standard

k (operation)

၇- ၅၉ Basement car park monitoring system- Controller wiring diagram

Basement car park basement car p k
(CO) exhaust f

(Compliance of Carbon Monoxide Content)

Singapore Standard 4 I (indoor occupied
space
(recommended) (CO) (level) M

k (CO)
(c Singapore Standards 553 - (Formerly CP 13)

basement car park monitoring system car p k

(zone) (CO) s M
exhaust fan (sh M
exhaust fan

၇.၈.၄ (CO) Sensor

s (sensitivity range)
Sensing r (CO)
se (sense)

(diameter)
(radius s
(positing)
car park z
sensor

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 Chapter-7 Ventilation

၇- ၆၀
(sensitiv . -
(detect)

s signal 4
s c

Basement car park carbon monoxide monitoring and demand control s

Direct Digital Controller (DDC) Programable Logic Controller(PLC)
s output
(value) h car park fan

၇.၈.၅ Control Strategies

Singapore S 4 I (recommended)
( 9 PPM S M
(၈) M S h
k h h . car park
fan M sh
M

Singapore Standard 530(Code of Practice 13) car park

“ Mode” 6 air ch 6 air ch car p k
office
k

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

(level) basement car park f

၆
p k ၆ ၃၀ ၉ ၀၀
(CO) ( basement car park
(energy s
basement car park fan Variable Speed Drive(VSD)
Variable Speed Drive(VSD) basement car park fan S
(speed)
“ Mode” Fire c “ Mode”
basement car park f 9 air ch
w
(fire inspection) (pass)

၇.၈.၆ (Energy Saving)

basement car park car park supply air f ၄ (15kW)
exhaust air f ၄ (15kW)
၇ ၆ fan ( h basement car park
monitoring s ၇ ၆
fan
Carbon monoxide monitoring s
(၆) k h (save 1 kWh
. k h
Week Days
4 No of car park supply air fan 15 kW
4 No of car park exhaust air fan 15 kW
Existing Load 30 kW
Existing kWh 30kW x 11 hrs x 5 days x 52 Weeks
85,800kWh
Estimated kW after complementation 23.5kW x 6 hrs x 5 days x 52 Weeks
46,800kWh
Estimated kWh Saving 67,219kWh - 24,449kWh
39,000kWh per year
Estimated kWh Cost Saving 39,000kWh x $0.2369/kWh
9,239 S$ per year
(energy saving) s car
p k Car park fan (

car p k CO sensor monitoring s

s

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 Chapter-7 Ventilation

(energy saving) (pay back

period

၇.၉ Mechanical Smoke Purging System for Basement Car Park

၇-၆၁ Smoke purging system

(basement car park) natural v

mechanical ventilation s
mechanical ventilation system ၆
(6 air change per hour 6 air ch h
basement car park (volume) (၆)
basement car park B
3
30,000 m B1 180,000 M

Centrilized air conditioning ACMV Servic

“ M ” “ Mode” operation M&E ser
“ M ” “ Mode”
main fire alarm
“ Mode” main fire alarm panel a M
S “ Mode”
main fire alarm ACMV s

Fire Alarm System a

 Shutting down of Air Handling Units of the affected areas
 Closing of smoke check doors for segregation of affected areas from non-affected areas
 Start-up of pressurization fans
 Start-up of smoke extraction fans (mechanical smoke control)
 Public Address System
 Grounding of all elevators

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

Smoke purging
system

a
6
air change per h 9 air
ch h

၇-၆၂ Basement car park smoke extraction system

၁၉၀၀ [1,900 m2] ba k

smoke purging s

S k FCC room remote p

FCC room k f
panel h s k f
h
S k duct . (heavy gauge sheet metal)

Exhaust fan r
(exhaust fan rating : 250°C @ 2 hrs)
Smoke purging system
generator power supply emergency power su
S k supply air exhaust air fan
Supply air f basem k

Exhaust air fan k fan

Exhaust supply air f
(hardwire inter-l k i - k
E h
supply air f (basement car park)

Supply air f ဂ )

၇.၁၀ (Outdoor Air Requirement)

ဂ
၌ ဂ (oxygen
concentration) (carbon dioxide
concentraion) (occupants)

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 Chapter-7 Ventilation

(fresh a
(outdoor air requirement)
(occupants)

(per person) (per floor area)

(outdoor air)

( ) (air flow rate per person) litres/second/

ဤ (per person )

(air quality)

(rate)
(contamination)
(rate)
( ) (per floor area) litres
2
per second per metre squared(l/s/m ဤ

(
)
(ဂ) (volume of the space) (air flow rate) Air Change rate
per Hour(ACH- Air change rate per hour
Ventilation infiltration

(heating system (cooling system

(outdoor air requirements)

၇.၁၀.၁ ASHRAE Standard 62.1 - 2004 (Minimum Ventilation Rates )

၂၀၀၄ ASHRAE ASHRAE Standard 62.1- 2004 (minimum ventilation rates)

Outdoor Air Rate (1) Default Values (2)

Occupancy
People Area Occupant Density CFM per CFM
Category
CFM/Person CFM/SF People/1,000 SF Person per SF
Correctional Facilities
Cell 5.0 0.12 25 10 0.25
Day Room 5.0 0.06 30 7 0.21
Guard Stations 5.0 0.06 15 9 0.14
Booking/Waiting 8. 0.06 50 9 0.44

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

Educational Facilities
Daycare (through age 4) 10.0 0.18 25 17 0.43
Classrooms (ages 5 to 8) 10.0 0.12 25 15 0.37
Classrooms (ages 9 plus) 10.0 0.12 35 13 0.47
Lecture Classroom 8. 0.06 65 8 0.55
Lecture Hall (fixed seats) 8. 0.06 150 8 1.
Art Classroom 10.0 0.18 20 19 0.38
Science Laboratories 10.0 0.18 25 17 0.43
Wood/Metal Shop 10.0 0.18 20 19 0.38
Computer Lab 10.0 0.12 25 15 0.37
Media Center 10.0 0.12 25 15 0.37
Music/Theater/Dance 10.0 0.06 35 12 0.41
Multiuse Assembly 8. 0.06 100 8 0.8
Food and Beverage Service
Restaurant Dining Rooms 8. 0.18 70 10
Cafeteria/Fast Food 8. 0.18 100 9 0.93
Bars/Cocktail Lounges 8. 0.18 100 9 0.93
General
Conference/Meeting 5.0 0.06 50 6 0.31
Corridors - 0.06 - - 0.06
Storage Rooms - 0.12 - - 0.12
Outdoor Air Rate (1) Default Values (2)
Occupancy
People Area Occupant Density CFM per CFM
Category
CFM/Person CFM/SF People/1,000 SF Person per SF
Hotel, Motels, Resorts, Dormitories
Bedroom/Living Room 5.0 0.06 10 11 0.11
Barracks Sleeping Areas 5.0 0.06 20 8 0.16
Lobbies/Prefunction 8. 0.06 30 10 0.29
Multipurpose Assembly 5.0 0.06 120 6 0.66
Office Buildings
Office Space 5.0 0.06 5 17 0.09
Reception Areas 5.0 0.06 30 7 0.21
Telephone/Data Entry 5.0 0.06 60 6 0.36
Main Entry Lobbie 5.0 0.06 10 11 0.11
Miscellaneous Spaces
Bank Vault/Safe Deposit 5.0 0.06 5 17 0.09
Computer (not printing) 5.0 0.06 4 20 0.08
Pharmacy (prep area) 5.0 0.18 10 23 0.23
Photo Studios 5.0 0.12 10 17 0.17
Shipping/Receiving - 0.12 - - 0.12
Transportation Waiting 8. 0.06 100 8 0.81
Warehouses - 0.06 - - 0.06

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 Chapter-7 Ventilation

Public Assembly Spaces

Auditorium Seating Area 5.0 0.06 150 5 0.81

Outdoor Air Rate Default Values

Occupancy
People Area Occupant Density CFM CFM
Category
CFM/Person CFM/SF People/1,000 SF per Person per SF
Places of Religious Worship 5.0 0.06 120 6 0.66
Courtrooms 5.0 0.06 70 6 0.41
Legislative Chambers 5.0 0.06 50 6 0.31
Libraries 5.0 0.12 10 17 0.17
Lobbies 5.0 0.06 150 5 0.81
M h ’ 8. 0.12 40 11 0.42
Museums/Galleries 8. 0.06 40 9 0.36
Retail
Sales (except as below) 8. 0.12 15 16 0.23
Mall Common Areas 8. 0.06 40 9 0.36
Barber Shop 8. 0.06 25 10 0.27
Beauty and Nail Salons 20.0 0.12 25 25 0.62
Pet Shops (animal areas) 8. 0.18 10 26 0.26
Supermarkets 8. 0.06 8 15 0.12
Coin-Operated Laundries 8. 0.06 20 11 0.21
Sports And Entertainment
Sports Arena (play areas) - 0.30 - - 0.30
Gym, Stadium (play area) - 0.30 30 - 0.30
Spectator Areas 8. 0.06 150 8 1.
Swimming Pool (pool and
- 0.48 - - 0.48
decks)
Disco/Dance Floors 20.0 0.06 100 21 2.
Health Club/Aerobics Rooms 20.0 0.06 40 22 0.86
Health Club/Weight Rooms 20.0 0.06 10 26 0.26
Bowling Alley (seating) 10.0 0.12 40 13 0.52
Gambling Casinos 8. 0.18 120 9 1.
Game Arcades 8. 0.18 20 17 0.33
Sages, Studios 10.0 0.06 70 11 0.76
Healthcare Facilities
Patient Rooms 25 - 10 25 -
Medical Procedure Rooms 15 - 20 15 -
Operating Rooms 30 - 20 30 -
Recovery and ICU 15 - 20 15 -

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Autopsy Rooms - 0.50 20 - 0.50

Physical Therapy 15 - 20 15 -
Residential Facilities (Single, Multiple)
Living Rooms 0.35 AC/hr. or 15 CFM/Person whichever is greater
Kitchens 100 CFM Intermittent 25 CFM Continuous
Baths, Toilets 50 CFM Intermittent or 20 CFM Continuous
Garages—separate for each dwelling unit 100 CFM per Car
Garages—common for several units 1.5 CFM/SF

၇.၁၁ Supply Air Rate

ai (total amount of air
flow) “S ir” supply air 100% outdoor air
(100% re-circulating air) Outdoor air re-
circulating air

( ) Heating cooling load supply air rate litres per second(l/s)

cubic metres per sec
( ) General ventilation extract system supply air rate Air Changes per
Hour(ACH

Air volume flow calculation (checking)

(air volume) air change rate air change rate

- Cooling load (air volume) 2.0 m3/s 2 air changes per hour
20 air changes per hour
Conventional ductwork system 20 air changes per hour (noise)

Ventilation Guide line Chartered Institution of Building

Services Engineers(CIBSE) Guide B2 Table 2.9 in section 2.3.2.1 Chartered Institution of
Building Services Engineers(CIBSE) Guide B Table 2.9 in section 2.3.2.1
Ventilation Outdoor Air Requirement
(design information) -

(Occupancy)
(outdoor air rate) a
(pattern)

(Use of the Area)

(source of contamination)
(air quality requirements)

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 Chapter-7 Ventilation

(Size of the Space)

(air change rate)
(checking)

System design data

Heating load cooling load supply air (flow)
Ventilation design criteria (air flow)
toilet exhaust (air change)

Design approach
Outdoor air requirements
( ) (occupancy) outdoor air rate

( ) (floor area) outdoor air rate

(museum) criteria ventilation rate

Design data

Outdoor air supply rate: 10 l/s/person( ၁၀ l/s )

Number of occupants: 200 people( ၂၀၀ )

Calculation procedure
Total outdoor air requirement

General mechanical ventilation

Air change rate CIBSE Guide B2 Table 3.1

Fresh Air Ventilation Rates

Fresh Air rate per person (l/s per person) CIBSE Guide B2 Table 3.3.
Design tip: (drawing) dimension Drawing length

outdoor air
allowance Variable Air Volume(VAV) system

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

supply air volume condition minimum outdoor air

Natural Ventilation
Habitable room
၂၀ ၁
(must not be less than 1/20 th of the floor area of the room
၁.၇

M h
H one air h h

Design Criteria
Ventilation system (basic requirement)

( ) (occupants (fresh air

( ) (smells (fumes (contaminants)

၇.၁၁.၁ (Outdoor Air Intake)

( ) Air con (outdoor air)
( )
(staircase pressurization) (outdoor air)

(ဂ) Ventilation
(outdoor air intake) (external wall) (roof
level)

(ASHRAE Standard 62.1-2004—–Air Intake Minimum Separation

Distances)
၂၀၀၄ ASHRAE ASHRAE Standard 62.1-2004 (Air Intake Minimum
Separation Distances)
(၁) Significantly contaminated exhaust (high contaminant concentration, significant sensory--irritation
intensity, offensive odor): 15 feet.
(၂) Noxious or dangerous exhaust air with highly objectionable fumes or gases and or exhaust
air with potentially dangerous contaminants (laboratory exhaust, fumes, gases, potentially
dangerous particles, bio--aerosols, gases at high concentrations to be harmful): 30 feet.
(၃) Vents, chimneys, flues, and other combustion appliance discharge: 15 feet.

(၄) Garage entry, automobile loading area, drive--in queue: 15 feet.

(၅) Truck loading area or dock, bus parking idling area: 25 feet.

(၆) Driveway, street, or parking area: 5 feet.

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(၇) Street or thoroughfare with high traffic volume: 25 feet.

(၈) Roof, landscaped grade or other surface directly below intake: 1 foot (or expected aver--
age snow depth, whichever is greater).
(၉) Garbage storage/pickup area, dumpsters: 15 feet.

(၁၀) Cooling tower intake or basin: 15 feet.

(၁၁) Cooling tower exhaust: 25 feet.

၇.၁၂ Contamination
(outdoor air intake) ႊ

(outdoor air intake) (exhaust discharge)

(၅)

k h (toilet) (car park) cooling tower

(rubbish dumps) (plant room)
exhaust discharge (၅ ) (၅)
c (outdoor air
intake) cooling tower (water droplet)

(outdoor air intake)၏ (၂.၁)

၇.၁၂.၁
(Air classification and recirculation)
Return Air = Air con space AHU
Transfer Air =
Exhaust Air = air classification
Return air transfer air exhaust air (air quality)
(contaminant concentration) ၍

၇.၁၂.၂ Return Air Transfer Air Exhaust Air

A. ASHRAE Standard 62.1--2004: Return Air, Transfer Air, or Exhaust Air Classifications

Class 1
Contaminant concentration
(sensory – irritation intensity)
(air) class 1
(၁) Offices. (၁၂) Electrical/telephone closets.
(၂) Reception/waiting areas. (၁၃) Elevator machine rooms.
(၃) Telephone/data entry. (၁၄) Laundry rooms within dwelling units.

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

(၄) Lobbies. (၁၅) Sports arena.

(၅) Conference/meeting rooms. (၁၆) Correctional facility day room and guard station.
(၆) Corridors. (၁၇) Computer rooms.
(၇) Storage rooms. (၁၈) Photo studios.
(၈) Break rooms. (၁၉) Shipping/receiving rooms.
(၉) Coffee stations. (၂၀) Transportation waiting rooms.
(၁၀) Equipment rooms. (၂၁) Mall common areas.
(၁၁) Mechanical rooms. (၂၂) Supermarkets.
(၂၃) Hotels, motels, resorts, dormitories: bedrooms, living rooms, barracks, sleeping quarters,
lobbies, prefunction spaces, multipurpose assembly.
(၂၄) Public assembly spaces: auditorium seating area, places of religious worship, court--
rooms, legislative chambers, libraries, lobbies, museums/galleries (all types).
(၂၅) Educational facilities: classrooms, lecture classrooms, lecture halls, computer lab, media
center, music/theater/dance studios, multiuse assembly.
(၂၆) Sports and entertainment: sports arena (play area), spectator areas, disco/dance
floors, bowling alleys, gambling casinos, game arcades, stages, studios.

Class 1
Class 1 (transfer)
(recirculate)

Class 2
Moderate contaminant concentration, mild sensor-irritation mild offensive odor
c
(၁) Kitchens and kitchenettes. (၁၅) Copy printing rooms.
(၂) Toilet/bath rooms (၁၆) Wood/metal shop classrooms.
(၃) Locker rooms. (၁၇) Correctional facility booking/waiting areas.
(၄) Locker/dressing rooms. (၁၈) Bank vaults/safe deposit vaults.
(၅) Central laundry rooms. (၁၉) Pharmacy preparation areas.
(၆) Science laboratories. (၂၀) Warehouses.
(၇) University and college laboratories. (၂၁) Coin operated laundries.
(၈) Art classrooms. (၂၂) Gym/stadium (play areas).
(၉) Retail sales areas. (၂၃) Swimming pools and decks.
(၁၀) Barber shops. (၂၄) Health club/aerobics rooms.
(၁၁) Beauty and nail salons. (၂၅) Health club/weight rooms.
(၁၂) Prison cells with toilets. (၂၆) Food and beverage services: restaurant dining
(၁၃) Darkrooms. rooms, cafeterias, fast food establish ments,
(၁၄) Pet shops (animal areas). bars, cocktail lounges.

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 Chapter-7 Ventilation

Class 2
Class 2 (recirculate)
ၲရ ယ္ ႏွင့္ က်န္းမာေရးကို ထိခိုက္ေစသည့္ ေလမ်ား
မပါဝင္ေသာ္လည္း တျခားေသာေနရာ မ်ားတြင္ ျပန္လည္အသံုးျပဳရန္ (recirculate) Class 2
class 2 class 3
similar purpose same pollutant source Class 4
(transfer) recirculate class 1
transfer recirculate

Class 3
Contaminant concentration
(sensory irritation) (offensive odor)
class 3

(၁) Commercial kitchen hoods other than grease (၆) Janitor closets.
hoods.
(၂) Residential kitchen vented hoods. (၇) Trash/recycle rooms.
(၃) Refrigeration machinery rooms. (၈) General chemical/biological laboratories.
(၄) Boiler rooms. (၉) Daycare sick rooms.
(၅) Soiled laundry storage areas.

Class 3
Class 3 class 3
(recalculate )
Class 4
Fume gases ၲရယ္ ကိုျဖစ္ေစသည့္ အမႈန္မ်ား
အမႈိက္မ်ား(potentially dangerous particles) ၲရာယ္ရွိေသာေလမ်ား၊(Bio aerosols) ၏
class 4
Recirculation
(၁) Commercial kitchen grease hoods. (၅) Chemical storage rooms.
(၂) Laboratory hoods. (၆) Auto repair rooms.
(၃) Paint spray booths. (၇) Parking garages.
(၄) Diazo printing equipment discharges.

Class 4

Class 4
Ventilation (outdoor air) indoor air (recalculate
(filter)
၍

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Air Conditioning and Mechanical Ventilation System(Vol. 1)

(flammable vapor) (dust) (odours)

(noxious gases)

၇.၁၃ Exhaust Air

၇.၁၃.၁ Toilet Ventilation Rates

(building regulations
h (toilet) (natural
means (mechanical means (vent
“ atural Ventilation”
“Mechanical Ventilation”

၇.၁၃.၂ Minimum Exhaust Rates

Exhaust Rate
Occupancy Category Comments
CFM/Unit CFM/SF
Art Classrooms - 0.70
Auto Repair Rooms - 1.50 Engine exhaust should be provided separately.
Barber Shop - 0.50
Beauty Shop and Nail Salons - 0.60
Cell with Toilet - 1.00
Darkrooms - 1.00
Additional ventilation may be required in arenas
Arena - 0.50
where combustion equipment is expected.
Kitchen—commercial - 0.70
Kitchenettes - 0.30
Locker Rooms - 0.50
Locker/Dressing Rooms - 0.25
Exhaust is not required if 50% of the sides are
Parking Garages - 0.75
open.
Janitor, Trash, Recycle - 1.00
Pet Shops (animal areas) - 0.90
Copy, Printing Rooms - 0.50
Science Lab Classrooms - 1.00
Rate is per water closet or urinal. Provide higher
rate where periods of heavy use are expected
Toilets—Public 50/70 -
(theaters, schools, sports facilities). Use lower
rate where use is intermittent.
Single occupancy toilets. Lower rate is for
Toilets—Private 25/50 - continuous operation; higher rate is for
intermittent operation.
Woodwork Shop/Classroom - 0.50

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 Chapter-7 Ventilation

၇.၁၃.၃ Exhaust Air Rates and Pressure Relationship

Pressure Minimum Minimum Total All Air
Area Designation Relationship OA AC/hr. AC/hr. Exhaust to
Outdoors
Obstetrical Facilities
Delivery Rooms Pos 3 15 -
Labor/Delivery/Recovery - 2 6 -
Labor/Delivery/Recovery/Postpartum - 2 6 -
Emergency, Surgery, and Critical Care
Operating/Surgical Cystoscopic Rooms Pos 3 15 -
Recovery Rooms 0 2 6 -
Critical and Intensive Care 0 2 6 -
Intermediate Care 0 2 6 -
Newborn Intensive Care 0 2 6 -
Treatment Rooms 0 - 6 -
Trauma Rooms Pos 3 15 -
Bronchoscopy Neg 2 12 Yes
Triage Neg 2 12 Yes
ER Waiting Rooms Neg 2 12 Yes
Procedure Rooms Pos 3 15 -
Laser Eye Rooms Pos 3 15 -
X-Ray (Surgical/Critical Care and
Pos 3 15 -
Catheterization)
Anesthesia Gas Storage Neg - 8 Yes
Support Areas
Medication Rooms Pos - 4 -
Clean Workrooms or Clean Holding Pos - 4 -
Soiled Workrooms or Soiled Holding Neg - 10 Yes
Diagnostic and Treatment Areas
Examination Rooms 0 - 6 -
Treatment Rooms 0 - 6 -
Physical Therapy and Hydrotherapy Neg - 6 -
Gastrointestinal Endoscopy Rooms 0 2 6 -
Endoscopic Instrument Processing Rooms Neg - 10 Yes
Imaging: X-Ray (Diagnostic and Treatment) 0 - 6 -
Imaging: Darkrooms Neg - 10 Yes
Imaging: Waiting Rooms Neg 2 12 Yes
Laboratory: General 0 - 6 -
Laboratory: Biochemistry Neg - 6 Yes
Laboratory: Cytology Neg - 6 Yes
Laboratory: Glass Washing Neg - 10 Yes
Laboratory: Histology Neg - 6 Yes

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Laboratory: Microbiology Neg - 6 Yes

Laboratory: Nuclear Medicine Neg - 6 Yes
Laboratory: Pathology Neg - 6 Yes
Laboratory: Serology Neg - 6 Yes
Laboratory: Sterilizing Neg - 10 Yes
Autopsy Rooms Neg - 12 Yes
Non-Refrigerated Body-Holding Rooms Neg - 10 Yes
Service Areas
Pharmacies Pos - 4 -
Food Preparation Centers 0 - 10 -
Pressure Minimum Minimum Total All Air
Area Designation Relationship OA AC/hr. AC/hr. Exhaust to
Outdoors
Warewashing Neg - 10 Yes
Dietary Day Storage Neg - 2 -
Laundry, General 0 - 10 Yes
Soiled Linen (Sorting and Storage) Neg - 10 Yes
Clean Linen Storage Pos - 2 -
Soiled Linen and Trash Chute Rooms Neg - 10 Yes
Bedpan Rooms Neg - 10 Yes
Bathrooms Neg - 10 -
Housekeeping Rooms Neg - 10 Yes
Sterilizing and Supply
ETO Sterilizer Rooms Neg - 10 Yes
Sterilizer Equipment Rooms Neg - 10 Yes
Central Medical and Surgical Supply: Soiled
Neg - 6 Yes
or Decontamination Rooms
Central Medical and Surgical Supply: Clean
Pos - 4 -
Workrooms
Central Medical and Surgical Supply: Sterile
Pos - 4 -
Storage
Note (1) Pos = Positive Pressure Relationship
Note (2) Neg = Negative Pressure Relationship
Note (3) 0 = Neutral Pressure Relationship

-End-

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 Chapter-7 Ventilation

Contents
၇.၁ (Indoor Air Quality [IAQ]) ........................................................................1

၇.၁.၁ (Causes of Poor IAQ) ..................................................

၇.၁.၂ (IAQ Control Methods) .....................................................

၇.၁.၃ (IAQ Factors) ........................................

၇.၁.၄ (CO2 Levels) (IAQ).....................................

၇.၂ (Natural Ventilation) ............................3

၇.၂.၁ Stack Effect ...................................................................................................................................

၇.၂.၂ (Design Information) ...........................................................

၇.၂.၃ Design outputs...............................................................................................................................

၇.၂.၄ (Calculation Approach) ....................................................................................................

၇.၂.၆ Design Watch Points ......................................................................................................................

၇.၃ Mechanical Ventilation .......................................................................................................8

၇.၃.၁ .......................................

၇.၄ Hospital Operation Room Ventilation ..................................................................................8

၇.၄.၁ Ceiling Construction .......................................................................................................................

၇.၅ (essential rooms) MV System ............... 13

၇.၅.၁ ( (Exit Staircase Internal

Passageway) ...........................................................................................................................................

၇.၅.၂ ( ) Smoke stop lobby .....................................................................................................................

၇.၅.၃ (ဂ) Fire Command Center (FCC Room) ............................................................................................

၇.၅.၄ (ဃ) Smoke Stop Lobby Fire Fighting Lobby ...............................................................................

၇.၅.၅ ( ) Fire Pump Room (Generator Room) ...........................................

၇.၅.၆ ( ) Flammable and Explosive Substances Rooms .............................................................................

၇.၅.၇ ( ) (Kitchen) ...................................................................................................

၇.၆ Air handling systems mechanical ventilation ............................................................... 30

၇.၆.၁ Smoke Tripping of AHU ..................................................................................................................

၇.၇ Engineered Smoke Control System - Design Consideration and Over View .......................... 33

၇.၇.၁ Designed Fire Size ..........................................................................................................................

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၇.၇.၂ Smoke Extraction System ................................................................................

၇.၈ Basement Car Park Carbon Monoxide Monitoring and Ventilation Fan Control System .........42

၇.၈.၁ Safe Level of (CO) ....................................................................

၇.၈.၂ Understanding of basement car park Mechanical Ventilation System Design ..............................

၇.၈.၃ Basement Car Park Carbon Monoxide Monitoring System's Design Consideration .......................

၇.၈.၄ (CO) Sensor .........................................................................................

၇.၈.၅ Control Strategies ................................................................................

၇.၈.၆ (Energy Saving) ...............................................................

၇.၉ Mechanical Smoke Purging System for Basement Car Park ................................................50

၇.၁၀ (Outdoor Air Requirement) .................................................................51

၇.၁၀.၁ ASHRAE Standard 62.1 - 2004 (Minimum Ventilation Rates ) .................................................

၇.၁၁ Supply Air Rate .............................................................................................................55

၇.၁၁.၁ (Outdoor Air Intake) ..............................................................................

၇.၁၂ Contamination .............................58

၇.၁၂.၁ ............................................

Return Air, Transfer Air Exhaust Air .........................................................

၇.၁၃ Exhaust Air ...................................................................................................................61

၇.၁၃.၁ Toilet Ventilation Rates .........................................................................................................

၇.၁၃.၂ Minimum Exhaust Rates .......................................................................................................

၇.၁၃.၃ Exhaust Air Rates and Pressure Relationship ..........................................................................

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