448
Flux
Gas pipe
(mmxmm)
1200m
3
/h
(20m
3
/min)
250×310
300m
3
/h
(5m
3
/min)
250×120
■ The length difference between pipes should be limited to be less than 2:1;
■ Make the piping as short as possible;
■ Keep the min. elbow quantity;
■ Wind the heat insulating material around the ange between the master
unit and the exhaust pipe for heat insulation and sealing. Install the piping
before tting up the ceiling.
6. Calculation of simple duct
Assume the friction resistance per unit is 1Pa/m, when the size of one side of air pipe is 25omm, like below gure:
A
B
■ Calculation of resistance in duct: ■ Simple duct selection Note:1Pa/m
Straight Pipe 1Pa per meter,1Pa/m
Bended Section
Each bend regarded as 3-4m
of straight pipe
Air Outlet 25Pa per outlet
Static Pressure Box 50Pa per static pressure box
Inlet Grille (with lter) 40Pa for each one
100
200
300
400
500
600 (10)
800
1000
1200 (20)
1400
1600
1800 (30)
2000
2400
3000 (50)
3500
4000
4500
5000
5500
6000 (100)
250×60
250×90
250×120
250×140
250×170
250×190
250×230
250×270
250×310
250×350
250×390
250×430
250×470
250×560
250×650
250×740
250×830
250×920
250×1000
250×1090
250×1180
Size
(mm×mm)
Shape
Item
Flux
m
3
/h (m
3
/min)
Square Pipe
Static pressure box With lter
Unit
Incorrect Incorrect Correct
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