Service Manual

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Venting Tables Cont.
Example: 100T199
A 3" balanced direct vent system has 30 feet of straight exhaust pipe and 30 feet of straight intake
pipe. It has 3- 90° elbows in the exhaust and 3- 90° elbows in the intake. It has 1- 45° elbow in
the exhaust and 1- 45° elbow in the intake.
Therefore:
6- 90° elbows x 5 feet = 30 feet.
2- 45° elbows x 2½ feet = 5 feet.
60 feet of straight pipe + 30 feet + 5 feet = 95 feet.
System is within “Maximum Combined Length” from table above.
NOTICE
For installations in Canada, field supplied vent piping must comply with CAN/CGA B149.1 (latest edition) and be
certified to the Standard For Type BH, Class II, 65°C, Gas Venting Systems, ULC S636. Components of this listed
system shall not be interchanged with other vent systems or unlisted pipe/fittings. All components and specified primers
and cements of the certified vent system must be from a single system manufacturer and not intermixed with other
system manufacturer’s vent system parts. The supplied vent connector and vent termination are certified under ULC
S636 and are also certified as part of the water heater. Refer to the following tables for approved venting materials,
primers, and cements. All approved primers and cements are to be used within their marked time limitations.
Approved Venting Materials
For installations in the US only
• PVC DWV (ASTM D-2665)
• PVC Sch. 40 (ASTM-D1785)
• CPVC Sch. 40 (ASTM-F441, ASTM-D2846)
• PVC and CPVC (UL 1738, ULC S636)
• ABS Sch. 40 DWV (ASTM-D2661)
• Polypropylene (UL 1738, ULC S636)
• Stainless Steel (UL 1738, ULC S636)
For installations in CANADA
• ULC S636 approved PVC for flue gas
venting rated Class II, 65°C
• ULC S636 approved CPVC for flue gas
venting rated Class II, 65°C
• ULC S636 approved Polypropylene for flue
gas venting rated Class II, 65°C
• Stainless Steel (ULC S636)
Approved Primers and Cements
For installations in the US only
• PVC and CPVC Primer (ASTM-F656)
• PVC Cement (ASTM D-2564)
• CPVC Cement (ASTM F493)
• ABS Primer and Cement (ASTM D-2235)
For installations in CANADA
• ULC S636 approved Primer and Cement for
flue gas venting rated Class II, 65°C
NOTICE
Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel
®
(polyphenosulfone) in non-metallic venting systems is prohibited and covering non-
metallic venting with thermal insulation is prohibited.
NOTICE
Before beginning installation of any vent pipe, read the vent pipe manufacturer’s installation instructions.
DO NOT install the water heater in any location where the ambient temperature may fall below freezing. Water heater
must be protected from freezing downdrafts during shutdown periods.
Provide protection of the building materials from degradation by flue gases from the exhaust vent terminal.
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