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Ventilation Essentials for Builders

The document discusses the purposes of ventilation which are to provide a supply of fresh air and remove contaminated air. It aims to supply oxygen for human existence, remove carbon dioxide and products of respiration and occupation like heat and moisture from people. Ventilation also helps remove contaminants from various sources including water vapour, cooking smells, industrial gases and vapours, and indoor and outdoor pollutants. There are two main types of ventilation - natural ventilation using natural forces and mechanical ventilation which uses fans or exhaust vents. Mechanical systems can be supply, extract or balanced. Kitchen extract ventilation comes in single or double skin hood designs, wall or island mounted, and its design considers the cooking area length, width and hood size.

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158 views11 pages

Ventilation Essentials for Builders

The document discusses the purposes of ventilation which are to provide a supply of fresh air and remove contaminated air. It aims to supply oxygen for human existence, remove carbon dioxide and products of respiration and occupation like heat and moisture from people. Ventilation also helps remove contaminants from various sources including water vapour, cooking smells, industrial gases and vapours, and indoor and outdoor pollutants. There are two main types of ventilation - natural ventilation using natural forces and mechanical ventilation which uses fans or exhaust vents. Mechanical systems can be supply, extract or balanced. Kitchen extract ventilation comes in single or double skin hood designs, wall or island mounted, and its design considers the cooking area length, width and hood size.

Uploaded by

akahay
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPT, PDF, TXT or read online on Scribd
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Supply of fresh air and

Removal of contaminated air

5/1/2019 PROMPT ACADEMY, THRISSUR 1


Purposes of Ventilation

 To provide a continuous supply of oxygen necessary


for human existence.
 To remove the products of respiration and
occupation, that is; heat, moisture and carbon
dioxide from people.

5/1/2019 PROMPT ACADEMY, THRISSUR 2


Purposes of Ventilation
 To remove contaminants such as :
 Water vapour
 Heat and smells from cooking
 Gases and vapours from industrial processes.
 Formaldehyde from; insulation foam, furnishings,
wallpaper, carpets, resin in wood products and
plasterboard.
 Outdoor aerosol pollutants such as; smoke, soot, mist,
fumes, pollen, plant fibres, mould spores, viruses and
bacteria
 Indoor aerosol pollutants such as; carpet fibres,
furniture fibres, clothing fibres, skin flakes, mites, viruses
and bacteria.
5/1/2019 PROMPT ACADEMY, THRISSUR 3
VENTILATION :
2 Types :

 Natural Ventilation
 Forced Ventilation

 Forced Ventilation is also called as Mechanical


Ventilation. (Using Fans / Exhaust vents.)

5/1/2019 PROMPT ACADEMY, THRISSUR 4


VENTILATION :

5/1/2019 PROMPT ACADEMY, THRISSUR 5


INFILTRATION & EXFILTRATION
 Infiltration : Air leakage into building through cracks and
other unintentional openings and through the normal use
of exterior doors.

 Exfiltration : Leakage of indoor air out of the building


through the similar types of openings.

5/1/2019 PROMPT ACADEMY, THRISSUR 6


Mechanical ventilation systems:
 3 Types :

1. Supply system
2. Extract system
3. Balanced system.

5/1/2019 PROMPT ACADEMY, THRISSUR 7


Kitchen Extract Ventilation :

5/1/2019 PROMPT ACADEMY, THRISSUR 8


Kitchen Extract Ventilation :
Different Types :

According to ducts :
1. Single skin hood
2. Double skin hood
According to position :
1. Wall mounted hood
2. Island hood

5/1/2019 PROMPT ACADEMY, THRISSUR 9


Kitchen Extract Ventilation :
Designing :
L = Length of cooking area
W = Width of cooking area
L’ = Length of Hood
W’= Width of Hood

L’ = L+ 0.8 H
W’=W+ 0.8 H

5/1/2019 PROMPT ACADEMY, THRISSUR 10


Kitchen Extract Ventilation :
 Cooking :
 Light cooking – Limited time, office, residential.
 Medium cooking – Bulk cooking, Restaurant, Hotels
 Heavy cooking – Flame cooking, Chinese, grilled.

Cfm calculation (For exhaust air) :


Light : P * 100 cfm
Medium : P * 150 cfm For fresh air :
Heavy : P * 200 cfm Cfm = 85% of exhaust fan.

5/1/2019 PROMPT ACADEMY, THRISSUR 11

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