22
Vent Lengths
Before starting the vent installation, careful
planning should be given to the routing and
termination of the vent pipes. The length of the
vent pipes (inlet and outlet) should be kept to
a minimum. Also, see pages 27,28, and 29 for
vent terminal placement. Refer to the maximum
and minimum vent length charts for the pipe
sizes that can be used and the total equivalent
length of pipe that can be used. DO NOT exceed
equivalent length of pipe in maximum vent length
chart.
DO NOT USE Schedule 20, Cell Core, Drain Pipe,
Galvanized, Aluminum or B-Vent.
Venting for Direct-Vent Water Heater
The vent termination is not included in the equivalency calculations.
NOTICE: A 90 degree standard bend concentric elbow is equivalent to 1 ft, 6 in. A 45 degree standard
bend concentric elbow is equivalent to 9 in.
SINGLE UNIT: MAX. EQUIVALENT VENT
LENGTHS - STRAIGHT PIPE
Number of
90° ELbows
Max Length 3"/5" Straight Pipe
0 43 ft. (13.1 m)
1 41.5 ft. (12.6 m)
2 38.5 ft. (12.2 m)
3 34 ft. (11.7 m)
4 28 ft. (11.3 m)
5 20.5 ft. (10.8 m)
6 11.5 ft. (10.4 m)
EQUIVALENT FT. OF ELBOWS
3" / 5"
90° 1.6 ft.
45° 9 in.
INSTALLATION INSTRUCTIONS
Venting
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