KCM Series Manual
17
Maximum vent length
Twin Pipe 3” PVC / CPVC
(90
° elbow is equivalent to 5 feet; 45° elbow is equivalent to 2.5 feet.)
Maximum Equivalent Vent Length 41 ft (12.5 m)
# of 90° Elbows
Maximum Vent Length in feet
(meters)
0
41 (12.5)**
1
36 (11.0) **
2
31 (9.4) **
3
26 (7.9) **
4
21 (6.4) **
5
16 (4.9) **
6
11 (3.4) **
**SW 1 in DIPSW 1 is “OFF” for lengths greater than
or equal to 21 feet.
Twin Pipe 4” PVC / CPVC
(90
° elbow is equivalent to 5 feet; 45° elbow is equivalent to 2.5 feet.)
Maximum Equivalent Vent Length 100 ft (30.5 m)
# of 90° Elbows
Maximum Vent Length in feet
(meters)
0
100 (30.5)**
1
95 (29.0) **
2
90 (27.4) **
3
85 (25.9) **
4
80 (24.4) **
5
75 (22.9) **
6
70 (21.3) **
Maximum Vent Length with Twin Pipe PVC / CPVC
(See Twin Pipe PVC/CPVC Vent Installation section for
more information regarding equivalent vent length
calculations.)
Summary of Contents for RUCS65i series
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