Installation Instructions

13
Exhaust vent (ABS, PVC, CPVC, or polypropylene vent)
This appliance can be vented with ABS, PVC, CPVC, or polypropylene (temperature rated up to
149°F). Vent material certied to ULC S636 standards is recommended in the USA. In Canada, plas-
tic venting must be certied 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 (de-
ducting 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.
*For each elbow added, deduct 5 ft. (1.5 m) from max vent length.
Excludes vent terminators, termination elbows, or rain caps.
Item Material CanadaUnited States
Exhaust pipe and
Fi
Schedule 40 PVC ANSI/ASTM D1785
PVC-DWV
ULC S636
Materials Only
ANSI/ASTM D2665
Schedule 40 CPVC ANSI/ASTM F441
Schedule 40 ABS-DWV ANSI/ASTM D2661
UL-1738Polypropylene
Pipe Cement/Primer
PVC ANSI/ASTM D2564
CPVC
ABS
ANSI/ASTM F493
ANSI/ASTM D2235
NOTE: Do NOT Use Cellular Foam Core Pipe
Diameter Max. No. of Elbows
53 in. (76 mm) 70
(21.3 m)
5
Max. V
cal and Horizontal (Total) Vent Length
4 in. (102 mm) 100
(30.5 m)
No. of Elbows 3" ven 4" ven
Up to 3,000
Max. V cal or Horizontal (Total) Vent Length
Up to 6,000
Up to 10,100
0
Up to 10,100
70 (21.3 m) 40 (12.2 m) 25 (7.6 m)
1
100 (30.5 m)
65
(19.8 m) 35 (10.7 m) 20 (6.1 m)
2
95 (29.0 m)
60
(18.3 m) 30 (19.1 m) 15 (4.6 m)
5
90 (27.4 m)
N/A45
(13.7 m) N/A 75 (22.9 m)