Takagi T-H3M-IN/OS - Manual (Page 11)

11
Page
Installation
Installation Manual
-Exhaust vent (ABS, PVC, CPVC, or polypropylene vent)-
The Indoor model 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
• The maximum length of exhaust vent piping must not exceed 70 ft (213 m) for 3” venting, which
depends on the elevation where the water heater is installed, and 100 ft (305 m) for 4” venting
(deducting 5 ft (15 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 (15 m), support the vent run at 3 ft (09 m) intervals
with overhead hangers
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
NOTE: Do NOT Use Cellular Foam Core Pipe
*For each elbow added, deduct 5 ft. (1.5 m) from max. vent length.
For details on the vent connection, refer to p 13 to 16
No. of
Elbow
2" venting 3" venting 4" venting
Up to 3,000 ft Up to 3,000 ft Up to 6,000 ft Up to 10,100 ft Up to 10,100 ft
0 65 ft (20 m) 70 ft (213 m) 40 ft (122 m) 25 ft (76 m) 100 ft (305 m)
1 15 ft (05 m) 65 ft (198 m) 35 ft (107 m) 20 ft (61 m) 95 ft (290 m)
2 N/A 60 ft (183 m) 30 ft (91 m) 15 ft (46 m) 90 ft (274 m)
3 N/A 55 ft (168 m) 25 ft (76 m) 10 ft (30 m) 85 ft (259 m)
4 N/A 50 ft (152 m) 20 ft (61 m) 5 ft (15 m) 80 ft (244 m)
5 N/A 45 ft (137 m) N/A N/A 75 ft (229 m)
Excludes vent terminators, termination elbows, or rain caps
Max. Vertical or Horizontal (Total) Vent Lengh