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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.
This water heater is supplied with
a two-inch Schedule 40 PVC 45°
vent terminal. When venting
with 3" pipe, a 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’
Maximum Vent Pipe
Length in Feet (ft)
2,001’ and above.
See Maximum Altitude
chart on left.
One (1) None 44 34
One (1) One (1) 41 31
Two (2) None 38 28
Two (2) One (1) 35 25
Three (3) None 32 22
Maximum Venting information for 2” Vents*
* For the 2” vent, one 90° elbow is approximately equal to 6 feet of vent pipe.
One 45° elbow is approximately equal to 3 feet of vent pipe.
Minimum vent length for 2”vent pipe is one (1) foot of vertical pipe, one (1)
90°elbow, and three (3) feet of horizontal pipe.
Number of 90° elbows
with Vent
Number of
45° Elbows
Maximum Vent Pipe
Length in Feet (ft)
0-Maximum Altitude: See chart on upper left.
One (1) None 95
One (1) One (1) 92.5
Two (2) None 90
Two (2) One (1) 87.5
Three (3) None 85
Three (3) One (1) 82.5
Four (4) None 80
Four (4) One (1) 77.5
Five (5) None 75
Maximum Venting information for 3” Vents**
** For the 3” vent, one 90° elbow is approximately equal to 5 feet of vent
pipe. One 45° elbow is approximately equal to 2.5 feet of vent pipe.
Minimum vent length for 3” vent pipe is one (1) foot of vertical pipe, one (1)
90°elbow, and four (4) feet of horizontal pipe.
Models
Maximum
Altitude for
2” & 3”
Vents
42VP40SF,
42VP40SPF,
42VP50SF,
42VP50SPF
5,200’
42VP40F,
42VP40PF,
42VP50F,
42VP50PF
7,700’