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mm of Water
in. of Water
660.4
26
609.6
24
558.8
22
508.0
20
457.2
18
406.4
16
Pressure
Drop
355.6
14
304.8
12
254.0
10
203.2
8
152.4
6
101.6
4
50.8
2
Note: When figuring the silencer pressure drop for side inlet, add 0.75 kPa
Figure 3 Silencer Back Pressure Drop (in. of water)
TP-6609 6/08
0
0.3
0.6
0.9
1.2
1.5
0
1
2
3
4
5
Exhaust Gas Velocity in Thousands
A = Hospital Silencer
B = Critical Silencer
C = Residential Silencer
D = Industrial Silencer
(86 mm of water or 3.4 in. of water) to the back pressure.
1.8
2.1
2.4
2.7
3.1 3.4
3.6
6
7
8
9
10
11
A
B
C
D
(m/min.)
4.0
4.3
(ft./min.)
12
13
14
Appendix 57
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