15
Maximum and Minimum Vent Lengths for Residential
40 & 50 Gallon Power Vents ONLY
NOTICE: The mixing of 2" and 3" vent pipe is not recommended. If 3" pipe is used, a 2" to 3"
reducer fitting is recommended at the rubber coupling.
A 2" (5 cm) or 3" (7.6 cm) Schedule 40 PVC 45° vent terminal must be used. Screens for both
2" and 3" vent terminals have been included.
Number of 90°
elbows with Vent
Number of
45° Elbows
Maximum Vent Pipe Length in
Feet (ft)
0’ - 2,000’
(0 m -609 m)
Maximum Vent Pipe Length
in Feet (ft)
2,001’ (610 m) and above.
One (1) None 95’ (29 m) 75’ (22.8 m)
One (1) One (1) 92.5’ (28 m) 72.5’ (22.1 m)
Two (2) None 90’ (27.4 m) 70’ (21.3 m)
Two (2) One (1) 87.5’ (26.7 m) 67.5’ (20.5 m)
Three (3) None 85’ (26 m) 65’ (19.8 m)
Three (3) One (1) 82.5’ (25 m) 62.5’ (19 m)
Four (4) None 80’ (24.4 m) 60’ (18.3 m)
Four (4) One (1) 77.5’ (24 m) 57.5’ (17.5 m)
Five (5) None 75’ (22.8 m) 55’ (16.7 m)
** For the 3” vent, one 90° elbow is approximately equal to 5 feet (1.52 m) of vent pipe. One 45°
elbow is approximately equal to 2.5 feet (0.76 m) of vent pipe.
Minimum vent length for 3” vent pipe is one (1) foot (30.4 cm) of vertical pipe, one (1)
90°elbow, and four (4) feet (1.21 m) of horizontal pipe.
Maximum Venting information for 3” Vents**
Maximum Venting information for 2” Vents*
* For the 2” vent, one 90° elbow is approximately equal to 6 feet (1.8 m) of vent pipe. One 45°
elbow is approximately equal to 3 feet (0.91 m) of vent pipe.
Minimum vent length for 2”vent pipe is one (1) foot (30.4 cm)of vertical pipe, one (1)
90°elbow, and three (3) feet (0.91 m) of horizontal pipe.
Number of 90°
elbows with Vent
Number of
45° Elbows
Maximum Vent Pipe Length in
Feet (ft)
0’ - 2,000’
(0 m -609 m)
Maximum Vent Pipe Length
in Feet (ft)
2,001’ (610 m) and above.
One (1) None 44’ (13 m) 24’ (7.3 m)
One (1) One (1) 41’ (12.5 m) 21’ (6.4 m)
Two (2) None 38’ (11.5 m) 18’ (5.5 m)
Two (2) One (1) 35’ (10.7 m) 15’ (4.5 m)
Three (3) None 32’ (9.8 m) 12’ (3.6 m)
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