Water Heater Installation Manual
21 Page
-Exhaust vent (ABS, PVC, CPVC, or polypropylene vent)-
The indoor models can be vented with schedule 40 PVC (temperature rated up to 149 °F), CPVC, ABS, or
polypropylene.
•
Item Material United States
Exhaust pipe and
Fittings
Schedule 40 PVC ANSI/ASTM D1785
PVC-DWV ANSI/ASTM D2665
Schedule 40 CPVC ANSI/ASTM F441
Schedule 40 ABS-DWV ANSI/ASTM D2661
Polypropylene UL-1738
Pipe Cement/Primer
PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493
ABS ANSI/ASTM D2235
Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel® (polyphenylsulfone) in
non-metallic venting systems is prohibited.
Covering non-metallic vent pipe and fittings with thermal insulation is prohibited.
(deducting 5 ft (1.5 m) for each elbow used in the venting system). Do not use more than 5 elbows.
See the table below.
• When the horizontal vent run exceeds 5 ft (1.5 m), support the vent run at 3 ft (0.9 m) intervals with
overhead hangers.
Installaon
Installaon Manual
Diameter Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
3 in 5 70 ft (21.3 m)
4 in 5 100 ft (30.5 m)
*For each elbow added, deduct 5 ft. (1.5 m) from max. vent length.
Vertical or Horizontal (Total) Vent Length
No. of
Elbows*
3" venting 4" venting
0 to 3,000 ft
(0 to 914 m)
3,001 to 6,000 ft
(915 to 1,829 m)
6,001 to 10,100 ft
(1,830 to 3,078 m)
0 to 10,100 ft
(0 to 3,078 m)
0 70 ft (21.3 m) 40 ft (12.2 m) 25 ft (7.6 m) 100 ft (30.5 m)
1 65 ft (19.8 m) 35 ft (10.7 m) 20 ft (6.1 m) 95 ft (29.0 m)
2 60 ft (18.3 m) 30 ft (9.1 m) 15 ft (4.6 m) 90 ft (27.4 m)
3 55 ft (16.8 m) 25 ft (7.6 m) 10 ft (3.0 m) 85 ft (25.9 m)
4 50 ft (15.2 m) 20 ft (6.1 m) N/A 80 ft (24.4 m)
5 45 ft (13.7 m) N/A N/A 75 ft (22.9 m)
*For each elbow added, deduct 5 ft (1.5 m) from max. vent length.
For details on the vent connection, refer to pages 22 to 24.
Excludes vent terminators, one termination elbow, or rain caps.