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Substitute duct lengths
Type of el-
Type
bow
90° elbow
45° elbow
90° elbow
45° elbow
90° concertina duct el-
bow
45° concertina duct el-
bow
90° segmented elbow
(3 welded seams)
90° elbow, Westaflex
ducting
45° elbow, Westaflex
ducting
Non-return flap
Table 1
Maximum permissible total ducting length
Internal minimum pipe diameter
(metal ducting)
5 7/8"
(150 mm)
7 1/16"
(180 mm)
7 7/8"
(200 mm)
Permissible counter pressure in the exhaust
ducting
Table 2
When connected to the vent ducting through the exhaust duct of a machine, particular care
must be taken to make sure the connection is secure and air-tight.
With complex ducting with many bends and additional components, or when several dif-
ferent machines are connected to a shared duct, it is recommended that a detailed
pipework calculation is carried out by a qualified specialist.
PDR
914/514
r = 2d
r = 2d
r = d
r = d
r = 2d
r = 2d
r = 2d
r = 2d
r = 4d
r = 2d
r = 4d
39' 4 7/16"
(12 m)
PDR x14 G
PDR x18 G
62' 4 1/16"
49' 2 9/16"
(19 m)
(15 m)
164' 1/2"
124' 8 1/16"
(50 m)
(38 m)
278' 10 7/16"
213' 3 1/16"
(85 m)
(65 m)
0.04 psi
0.04 psi
(280 Pa)
(290 Pa)
en - Installation notes
PDR
PDR
918/518
922/522
3' 7 5/16" (1.1 m)
2' 3 9/16" (0.7 m)
6' 2 13/16" (1.9 m)
3' 7 5/16" (1.1 m)
10' 6" (3.2 m)
6' 6 3/4" (2 m)
3' 11 1/4" (1.2 m)
3' 11 1/4" (1.2 m)
2' 11 7/16" (0.9 m)
3' 3 3/8" (1 m)
2' 7 1/2" (0.8 m)
39' 4 7/16"
22' 11 9/16"
(12 m)
(7 m)
PDR x22 G
PDR x28 G
39' 4 7/16"
32' 9 11/16"
(12 m)
101' 8 1/2"
(31 m)
173' 10 5/8"
157' 5 3/4"
(53 m)
0.04 psi
(290 Pa)
(290 Pa)
PDR
PDR
928/528
944/544
22' 11 9/16"
21' 3 7/8"
(7 m)
(6.5 m)
PDR x44 G
32' 9 11/16"
(10 m)
(10 m)
88' 7"
78' 8 7/8"
(27 m)
(24 m)
130'
(48 m)
(40 m)
0.04 psi
0.03 psi
(240 Pa)
5
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