American Water Heater PowerVent Use & Care Manual page 13

Maximum and Minimum Vent Lengths for Residential
40 & 50 Gallon Power Vents
Models Maximum
Altitude
for
2" & 3"
Vents
42VP40FN 2,000'
42VP50FN
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.
Minimum vent length for 2"vent pipe is one (1) foot of vertical pipe, one (1)
90°elbow, and two (2) feet of horizontal pipe.
Maximum Venting information for 2" Vents*
Number Number
of 90° of 45°
elbows Elbows
with Vent
One (1) None
One (1) One (1)
Two (2) None
Two (2) One (1)
Three (3) None
* 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 3" vent pipe is one (1) foot of vertical pipe, one (1)
90°elbow, and two (2) feet of horizontal pipe.
Maximum Venting information for 3" Vents**
Number of 90° elbows
with Vent
0-Maximum Altitude:
One (1)
One (1)
Two (2)
Two (2)
Three (3)
Three (3)
Four (4)
Four (4)
Five (5)
** 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.
Maximum Vent Pipe
Length in Feet (ft)
0' - 2,000'
44
41
38
35
32
Number of
45° Elbows
See chart on upper left.
None
One (1)
None
One (1)
None
One (1)
None
One (1)
None
Maximum Vent Pipe
Length in Feet (ft)
95
92.5
90
87.5
85
82.5
80
77.5
75
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