BSB

SINGLE INLET
CENTRIFUGAL FAN
with Backward Wheels
 BSB Series
SINGLE INLET CENTRIFUGAL FAN with Backward Wheels

Kruger *certifies that the BSB series shown herein

shown herein is licensed to bear the AMCA Seal.
Seal. The ratings shown are based on tests and   
procedures performed in accordance with AMCA
 
Publication 211 and AMCA Publication 311 and
comply with the requirements of the AMCA     
Certified Ratings Program.
*  +    ,- 
./*  ,- 
 *  ,- 
 7 *  ,- 
8*  ,- 
*  2 3,- 
*  +   2+ 3#4 - 
*  +   25 + 3#4 - 
#*  + 
4 +   236
01+     
*  +   2 3,- 
*  +   2*  "3,- 
 BSB Series

BSB Series
Single Inlet Centrifugal Fans - Backward wheels
The BSB series is SISW centrifugal fans with high efficiency non-overloading backward curved impellers.
The fans are suitable for supply or exhaust applications in commercial, process and industrial HVAC systems.
Sizes of this series are in accordance with AMCA standard 99.

Type / Operating Limit

Each fan type has its maximum operating speed and power due to its mechanical design.
The operating limit of different fan types of BSB series is set according to the requirement of class I, II
and III limit as defined in AMCA standard 99.
The BSB series is available in type C, T, X, Z, U, or P.

Model 315 to 630

Type C-U-P Model 710 to 1400

Type T-U-P Model 1600 to 2000
Type X-U-P
Type Z-U-P

Type C
This type has a frame fitted on both sides of the fan, providing better strength and rigidity.
It allows mounting in four different orientations.
Fan Size : 315 to 630
Volume : 1500 to 20000 m3/h
Total Pressure : up to 2000 Pa

Type T
This type has a welded frame, giving increased stiffness and rigidity required for higher
operating performance.
Fan Size : 315 to 1400
Volume : 1500 to 100000 m3/h
Total Pressure : up to 3000 Pa

Type X/Z
This structure is similar to Type T but utilizes enhanced bearings to support higher dynamic
load necessary for the increased performance.
Fan Size : 315 to 1400
Volume : 1500 to 100 000m3/h
Total Pressure: up to 5000 Pa

Type Z is non-standard, for more information, please consult your nearest Kruger office for
details.

Type P
This type is manufactured with a special frame with two bearings fixed externally to the
airflow eliminating any obstruction to the inlet and allow operation with air temperature
up to max. of 200ࢃC
Fan Size : 315 to 1400
Volume : 1500 to 100 000 m3/h
Total Pressure : up to 5000 Pa

1
BSB Series

Type U
This type is manufactured with a special frame with two bearings fixed externally to the
airflow eliminating any obstruction to the inlet and allow operation with air temperature
up to max. of 200ࢃC.
Fan Size : 315 to 2000
Volume : 1500 to 360 000 m3/h
Total Pressure : up to 5000 Pa

BSB type U size 315 to 1400 is also available for smokespill application and smoke exhaust
operation in shopping malls, hospitals, commercial buildings, airport etc. Certified by TUV
SUD in accordance with EN 12101-3:2015 and satisfied the performance criteria for class
F250, F300, F400.

Fan Size : 315 to 1400

Volume : 1500 to 180 000 m3/h
Total Pressure : up to 4000 Pa

Certification

             

       

           2015

F400, Ff 250, Ff 300 etc.

Temperature Minimum functioning period

Class
(ѿC) (minutes)

  
฀   

f   

f   

 !"!    # $%"$& '  (

3:2015      *      +    ',

The company is always improving and developing its products, therefore the company reserves the right of making changes to the illustrated products.
Certified dimension can be provided upon request.

2
BSB Series

TECHNICAL SPECIFICATION
Wheel
The wheel of BSB series is made of cold rolled sheet steel backward curved
blades with polyester powder coating finish.
Housing
For all sizes except 1250 and above, the housing is manufactured in galvanized
sheet steel with the housing fixed to the side plates in "pittsburg lock" form
system.
Housing for 1250 and 2000 are manufactured in mild steel finished with
polyester powder coating.
Fully welded steel plate housings with painted finish are available for all sizes
upon request.
Frame
The frame is manufactured with galvanized angular bars for type "C". For type
"T", "X", "U" and “P”, they are manufactured with sections of steel with
polyester powder coating finish.
Shaft
Shafts are manufactured from C45 carbon steel using an automatic process for
positioning and cutting of the keyways. All dimensional tolerances of the shaft
are fully checked to ensure a precision fit. All shafts are then coated with an
anti-corrosion varnish after assembly.
Bearings
Bearings used are either deep groove ball bearing type with an adapter sleeve,
or spherical roller bearings sealed at both sides for different duty application
and are classified as below:

Mounted in a
Mounted on cast iron supports with grease point
rubber housing

C T X U
Fan Type

CM Medium Duty TM Medium Duty XM Medium Duty UM Medium Duty

Bearing Duty

eg. Model:
TX Extra Heavy Duty XX Extra Heavy Duty UX Extra Heavy Duty
BSB 450 C M

Fan Bearing Duty (M, X)

Fan Type (C, T, X, Z, U)

Fan Size (315, 355, 400…1400)

Except TX, XX, UX extra heavy duty bearings, all bearings are lubricated for life and
maintenance-free. If re-lubrication is necessary, it is recommended to use a lithium
base grease suitable for all temperatures within the operational limits.
For type P bearing, please consult your nearest Kruger office for details.

3
 BSB Series

Balancing Quality
All wheels are statically and dynamically balanced to ISO1940 and
AMCA 204 – G2.5 standards.
All fans after assembly are trim-balanced to ISO1940 and AMCA 204 -
G2.5 standard.
Clean room application fans with balancing grade of G1.0 are available
upon request.

ACCESSORIES
Casing Drain
This option is available when using fans exposed to the atmosphere or
operating in high humidity conditions.
P3

Outlet Flanges
Outlet flanges are available upon request.
Inlet Flanges
This option are set against the fan to facilitate installation. It is available
P4 in 2 types-“L” flange or “U” flange.
Inspection Doors
The inspection door can be supplied upon request. It can be supplied in
one of the three positions (P3, P4 & P5).
P5

Guards
Inlet guards, discharge guards and non-drive end shaft guards are
available on request.

Fan Rotation and Discharge

The rotation and discharge of the fan is in accordance with AMCA standard 99.
The direction of rotation is determined from the drive side of the fan :-

CW - clockwise rotation CCW - counter-clockwise rotation

CW90 CW180 CW270 CW360 CCW90 CCW180 CCW270 CCW360

Motor Position
The position of the motor for belt drive
centrifugal fan is in accordance with AMCA
standard 99.
Location of motor is determined by facing the
drive side of fan and designated by letters W,
X, Y, or Z.

4
BSB Series

100
80 Motor Selection
60
Correction Factor, % motor power output

40
The power curves shown on each performance
30 graph represent the absorbed power at the shaft of
20 the fan measured in kW.
15
To determine the power of the motor to be
10
8 installed, a correction factors should be applied to
2 Pole
6 compensate for transmission losses.
4 & 6 Pole
4

3
For conversion to horsepower (HP), use multiplying
2
factor 1.34.
1.5

1
0.45

0.75

22.5
30
15

45
60
75

150

225
300

450
0.2

0.3

0.6

1.5

2.2

4.5

7.5
3

Motor power output (kW)

Dynamic Pressure

Both dynamic pressure and outlet air velocity values shown on each graph are calculated base on the full discharge area, i.e.
ducted outlet conditions.
With free outlet conditions the velocity pressure is higher. To determine this new value, multiply the velocity pressure of the
ducted outlet obtained from the fan curve by the following correction factor “K”.

K = 1.67
Fan performances calculated with this correction factors are not licensed by AMCA International.

Performance
The performance data shown on each graph is derived from tests conducted in accordance to AMCA Standard 210 –
Fig 12 – installation type B (free inlet and ducted outlet condition).

Ratings refer to the standard air density with the total pressure as a function of the air volume, using logarithmic scales.

It is essential that the same installation type and test standards are used at all times when comparing fan performance.

Noise

The noise levels shown on each graph refer to the "A-weighted" sound power values and the data on the inlet side has been
measured in accordance with AMCA Standard 300 Fig. 2, Installation Type “B”. The noise levels of the fans are determined
as follows :

■ Sound power level - ("A" scale): Lw (A) as catalogue

■ Octave band spectrum: Lw = Lw(A) + Lw rel. dB [refer to Kruger for more details]

■ Sound pressure level:

a) free field
Lp(A) = Lw(A) - (20log10d) -11

b) room conditions
Lp(A) = Lw(A) - (20log10d) -8

where d = distance from fan (m)

5
 BSB Series

Performance
The performance data shown on each diagram is derived from tests
conducted in accordance to AMCA Standard 210- Fig 12- Installation type
B (free inlet and duct outlet condition).
Ratings refer to standard air density with the total pressure as a function
of the air volume, using logarithmic scale.
It is essential that the same installation type and test standards are used
at all time when comparing fan performance.
According to AMCA 205, BSB series can be classify as FEG 80~85 based
on fan peak efficiency. The following is the explanation of FEG
classification:
1. Fan size is the impeller diameter in mm.
2. The fan peak efficiency shall be calculated from the fan (total)
pressure.
3. If this method is used for a direct driven fan, the fan efficiency is the
impeller efficiency.
4. The FEG label for a given fan size is assigned when the fan peak
efficiency is equal to or lower than the efficiency at the grade upper
limit, and higher than the efficiency at the grade upper limit of the
next lower grade for the fan size.
5. For any fan sizes larger than 1016 mm, the values of the grade upper
limits are the same as for a size of 1016 mm.
6. No labels are considered for the fans with the fan peak total
efficiency below FEG 50.
7. The values of efficiencies are calculated for fan sizes in the preferred
R40 Series.
8. Not all available fan sizes are shown.

Fan Efficiency Grades (FEG) for Fans without Drives (SI) – AMCA 205

6
Example of Selection


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1    
1 21  "

 































3 4

     "  








Air Volume Q = 10,000 m3/h 

  !

Outlet Velocity V = 10.16 m/s 

Dynamic Pressure Pd = 62 Pa
  "

Total Pressure Pt = 800 Pa  



 


Fan Speed N = 1400 rpm
 

 

Absorbed Power W = 3.01 kW

 


"
 
Total Efficiency h = 73.8 %  

" 

 
Sound Power Level Lw(A) = 94 dB(A)
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