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• The maximum length of exhaust vent piping must not exceed 21.3 m (70 ft.) for 76 mm (3")
venting, which depends on the elevation where the water heater is installed. 30.5 m (100 ft.)
for 102 mm (4") venting (deducting 1.5 m (5 ft.) 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 1.5 m (5 ft.), support the vent run at 0.9 m (3 ft.) intervals
with overhead hangers.
Diameter
76 mm (3 in.)
102 mm (4 in.)
*For each elbow added, deduct 1.5 m (5 ft.) from max. vent length.
No. of Elbows
(0 to 3,000 ft.)
0
21.3 m (70 ft.)
1
19.8 m (65 ft.)
2
18.3 m (60 ft.)
3
16.8 m (55 ft.)
4
15.2 m (50 ft.)
5
13.7 m (45 ft.)
Excludes vent terminators, one termination elbow or rain caps
For details on the vent connection to these models, refer to p. 16.
Horizontal Installation Diagram
Hanger
Connect between exhaust vent collar and plastic piping.
See the next page for instructions.
For details of the optional items, refer to the Installation manual for each Optional item.
Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
5
5
Max. Vertical or Horizontal (Total) Vent Length
76 mm (3") venting
Elevations
Elevations
0 to 914 m
915 to 1,828 m
(3,001 to 6,000 ft.)
12.2 m (40 ft.)
10.7 m (35 ft.)
9.1 m (30 ft.)
7.6 m (25 ft.)
6.1 m (20 ft.)
N/A
-Plastic Venting Illustrations-
Wall
Hanger
15
21.3 m (70 ft.)
30.5 m (100 ft.)
Elevations
1,829 to 3,100 m
(6,001 to 10,100 ft.)
7.6 m (25 ft.)
6.1 m (20 ft.)
4.6 m (15 ft.)
3.0 m (10 ft.)
N/A
N/A
Vertical Installation Diagram
Roof
Page
Installation Manual
Installation
102 mm (4") venting
Elevations
0 to 3,100 m
(0 to 10,100 ft.)
30.5 m (100 ft.)
29.0 m (95 ft.)
27.4 m (90 ft.)
25.9 m (85 ft.)
24.4 m (80 ft.)
22.9 m (75 ft.)
Roof
Flashing
Fire stop
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