26
Installation Manual
Vent Pipe Materials
Caution
Use of cellular core PVC (ASTM F891), cellular core CPVC, or
Radel® (polyphenylsulfone) in no-nmetallic venting systems is
prohibited. Covering non-metallic vent fittings with thermal
insulation is prohibited.
Venting requirements differ in the USA and Canada. Consult the
following chart or the most recent edition of ANSI Z223.1/NFPA
54 or CAN/CGA B149.1, as well as all applicable local codes and
regulations when selecting vent pipe materials. Do not use cellular
core-based pipe materials for the exhaust vent.
Locale
Recommended Vent Materials
USA
•
PVC Schedule 40 (solid core)
•
CPVC Schedule 40 or 80 (solid core)
•
Approved Polypropylene
Canada*
•
Type BH Special Gas Vent Class IIA (PVC)
•
Type BH Special Gas Vent Class IIB (CPVC)
•
Thpe BH Special Gas Vent Class IIC (Polypropylene)
* For installation in Canada, field-supplied plastic vent piping must comply with
CAN/CGA B149.1 (latest edition) and be certified to the Standard For Type
BH Gas Venting Systems, ULC-S636. Components of this listed system must
not be interchanged with other vent systems or unlisted pipes or fittings.
All plastic components and specified primers and glues of the certified
vent system must be from a single system manufacturer and must not be
intermixed with another system manufacturer’s parts. The supplied vent
connector and vent termination are certified as part of the water heater.
Vent Length
The maximum vent length when using 2" exhaust ducts is 50’. The
maximum vent length when using 3" vent ducts is 100’. The intake
duct length can be of equal length to the exhaust duct length. Both
maximum lengths are reduced by the number of elbows used, as
shown in the following table:
Vent
Size
Maximum
Length
Maximum
# of
Elbows
Equivalent Lengths
2"
50' (15 m)
5
Reduce the maximum vent
length accordingly for each
elbow used:
•
Each 90° elbow equates
to 8 linear feet (2.4 m)
of vent
•
Each 45° elbow equates
to 4 linear feet (1.2 m)
of vent
3"
100' (30 m)
6
Reduce the maximum vent
length accordingly for each
elbow used:
•
Each 90° elbow equates
to 5 linear feet (1.5 m)
of vent
•
Each 45° elbow equates
to 3 linear feet (0.9 m)
of vent
Notice
•
The maximum length does not include any elbows.
•
If using a concentric termination as shown on pages 27, count this as
8 linear feet (2.4 m) of vent.
Summary of Contents for VH-150
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