18
Page
-Exhaust vent (
^͕Ws͕Ws͕ŽƌƉŽůLJƉƌŽƉLJůĞŶĞ
vent)-
The Indoor models can be vented with ABS, PVC, CPVC, or polypropylene (temperature rated up to
149 °F). Vent material certified to ULC S636 standards is recommended in the USA. In Canada, plastic
venting must be certified to ULC S636 standards.
ͻ
The maximum length of exhaust vent piping must not exceed 70 ft (21.3 m) for 3” venting, which
depends on the elevation where the water heater is installed, and 100 ft (30.5 m) for 4” venting
(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.
ͻ
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.
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Item
Material
United States
Canada
Exhaust pipe and
Fittings
Schedule 40 PVC
ANSI/ASTM D1785
ULC S636 Certified
Materials Only
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.
Diameter
Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
3 in. (76 mm)
5
70 ft (21.3 m)
4 in. (102 mm)
5
100 ft (30.5 m)
*For each elbow added, deduct 5 ft. (1.5 m) from max. vent length.
No. of Elbows
Max. Vertical or Horizontal (Total) Vent Length
3" (76 mm) venting
4" (102 mm)
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)
Excludes vent terminators, termination elbows, or rain caps.
For details on the vent connection, refer to pp. 20 and p. 21.
Printed on 12/6/2017 8:34 AM CT
