Takagi T-H3J-DV Installation Manual And Owner's Manual page 15

-Exhaust vent (ABS, PVC, CPVC, or polypropylene vent)-
The Indoor models can be vented with ABS, PVC, CPVC, or polypropylene (temperature rated up to at
least 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.
Item
Exhaust pipe and
Fittings
Pipe Cement/Primer
• 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.
• 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.
Diameter
3 in. (76 mm)
4 in. (102 mm)
*For each elbow added, deduct 5 ft. (1.5 m) from max. vent length.
No. of Elbows
Up to 3,000 ft
0 70 ft. (21.3 m)
1 65 ft. (19.8 m)
2 60 ft. (18.3 m)
5 45 ft. (13.7 m)
Excludes vent terminators, termination elbows, or rain caps.
For details on the vent connection, refer to p. 16 and p. 17.
Material
Schedule 40 PVC
PVC-DWV
Schedule 40 CPVC
Schedule 40 ABS-DWV
Polypropylene
PVC
CPVC
ABS
NOTE: Do NOT Use Cellular Foam Core Pipe
Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
5
5
Max. Vertical or Horizontal (Total) Vent Length
3" venting
Up to 6,000 ft
40 ft. (12.2 m)
35 ft. (10.7 m)
30 ft. (19.1 m)
N/A
15
United States
ANSI/ASTM D1785
ANSI/ASTM D2665
ANSI/ASTM F441
ANSI/ASTM D2661
UL-1738
ANSI/ASTM D2564
ANSI/ASTM F493
ANSI/ASTM D2235
70 ft. (21.3 m)
100 ft. (30.5 m)
Up to 10,100 ft
25 ft. (7.6 m)
20 ft. (6.1 m)
15 ft. (4.6 m)
N/A
Page
Installation Manual
Installation
Canada
ULC S636 Certified
Materials Only
4" venting
Up to 10,100 ft
100 ft. (30.5 m)
95 ft. (29.0 m)
90 ft. (27.4 m)
75 ft. (22.9 m)