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Installation Manual
Page
11
-Exhaust vent (ABS, PVC, CPVC, or Polypropylene vent)-
The micro-boiler can be vented with ABS, PVC, CPVC, or Polypropylene (temperature rated up to at
least 149° F). Vent material certied to ULC S636 standards is recommended in the USA. In Canada,
plastic venting must be certied to ULC S636 standards.
• 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 micro-boiler 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.
-Max. Vertical or Horizontal (total) Vent Length-
Item Material United States Canada
Exhaust pipe and
Fittings
Schedule 40 PVC ANSI/ASTM D1785
ULC S636 Certied
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
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 6.5 ft. (2.0 m) 70 ft. (21.3 m) 40 ft. (12.2 m) 25 ft. (7.6 m) 100 ft. (30.5 m)
1 1.5 ft. (0.5 m) 65 ft. (19.8 m) 35 ft. (10.7 m) 20 ft. (6.1 m) 95 ft. (29.0 m)
2 N/A 60 ft. (18.3 m) 30 ft. (9.1 m) 15 ft. (4.6 m) 90 ft. (27.4 m)
3 N/A 55 ft. (16.8 m) 25 ft. (7.6 m) 10 ft. (3.0 m) 85 ft. (25.9 m)
4 N/A 50 ft. (15.2 m) 20 ft. (6.1 m) 5 ft. (1.5 m) 80 ft. (24.4 m)
5 N/A 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 the "-Intake and Exhaust Venting Illustrations-"
section beginning on page 13.
* For each elbow added, deduct 5 ft. (1.5 m) from max. vent length.
Installation - Venting
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