Miele PDR 922 - Duct Length and Diameter Specifications

Installation
*INSTALLATION*
52
Substitute duct
lengths
Type of
elbow
Type PDR
914/514
PDR
918/518
PDR
922/522
PDR
928/528
PDR
944/544
90° elbow r=2d 3' 7 5/16" (1.1m)
45° elbow r=2d 2' 3 9/16" (0.7m)
90° elbow r=d 6' 2 13/16" (1.9m)
45° elbow r=d 3' 7 5/16" (1.1m)
90° concertina
duct elbow
r=2d 10' 6" (3.2m)
45° concertina
duct elbow
r=2d 6' 6 3/4" (2m)
90° segmented el-
bow
(3welded seams)
r=2d 3' 11 1/4" (1.2m)
90° elbow, West-
aflex ducting
r=2d
r=4d
3' 11 1/4" (1.2m)
2' 11 7/16" (0.9m)
45° elbow, West-
aflex ducting
r=2d
r=4d
3' 3 3/8" (1m)
2' 7 1/2" (0.8m)
Non-return flap 39' 4 7/16"
(12m)
39' 4
7/16"
(12m)
22' 11
9/16"
(7m)
22' 11
9/16"
(7m)
21' 3
7/8"
(6.5m)
Table1
Maximum permis-
sible total ducting
length
Internal minimum pipe diameter
(metal ducting)
PDRx14 PDRx18 PDRx22 PDRx28 PDRx44
5 7/8" (150mm) 62' 4 1/16"
(19m)
49' 2 9/16"
(15m)
39' 4 7/16"
(12m)
32' 9
11/16"
(10m)
32' 9
11/16"
(10m)
7 1/16" (180mm) 164' 1/2"
(50m)
124' 8
1/16"
(38m)
101' 8 1/2"
(31m)
88' 7"
(27m)
78' 8 7/8"
(24m)
7 7/8" (200mm) 278' 10
7/16"
(85m)
213' 3
1/16"
(65m)
173' 10
5/8"
(53m)
157' 5 3/4"
(48m)
130'
(40m)
Permissible counter pressure in
the exhaust ducting
EL: electrically heated
G: gas-heated
SI/HW: steam-heated/hot water-
heated
EL:
0.05psi
(220Pa)
G:
0.04psi
(280Pa)
SI/HW:
-
EL:
0.05psi
(340Pa)
G:
0.04psi
(290Pa)
SI/HW:
0.03psi
(200Pa)
EL:
0.05psi
(350Pa)
G:
0.04psi
(290Pa)
SI/HW:
0.04psi
(310Pa)
EL:
0.06psi
(410Pa)
G:
0.04psi
(290Pa)
SI/HW:
0.07psi
(510Pa)
EL:
0.04psi
(310Pa)
G:
0.03psi
(240Pa)
SI/HW:
0.06psi
(390Pa)
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 compo-
nents, or when several different machines are connected to a
shared duct, it is recommended that a detailed pipework calculation
is carried out by a qualified specialist.