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6 - COMBUSTION AIR AND VENT PIPING
6.5 Approved Venting Materials
6.6 Vent Termination
• Terminate combustion air and vent pipes with fittings or
coaxial vent kit.
Use horizontal pipe for vent and 90° elbow for
combustion air termination when using fittings.
• Separate vent terminal from air inlet terminal to prevent
flue gas recirculation. If T-Terminal is used on flue pipe
at sidewall, air inlet terminal shall be at least 36" or more
away from vent terminal.
• Locate combustion air termination as far as possible from
swimming pool, swimming pool pump house, and other
sources of airborne chlorine.
• Locate combustion air and vent terminals as required by
authority having jurisdiction.
Vent Material Options
GMHB227
GMHB380
1
5"/3" [125mm/80m] polypropylene coaxial.
1
4" / 6" [110 mm / 1600 mm] polypropylene
coaxial.
2
3" [80mm] polypropylene twin pipe.
Shall be polypropylene on BOTH intake and
exhaust.
2
4" [110mm] polypropylene twin pipe.
Shall be polypropylene on BOTH intake and
exhaust.
3
3" [80mm] flexible polypropylene for chimney
exhaust vent, shall have rigid 3" [80mm]
polypropylene on air intake.
3
4" [110mm] flexible polypropylene for chimney
exhaust vent, shall have rigid 4" [110mm]
polypropylene on air intake.
* Note: Adapters and fittings used with all vent systems shall be from same manufacturer and compatible with the vent
pipe. See list for approved Manufacturers.
Installation shall conform to requirements of authority having
jurisdiction or in absence of such requirements:
• USA - National Fuel Gas Code, ANSI Z223.1/NFPA 54.
WARNING
Manufacturer recommends this condensing boiler be
vented with approved polypropylene venting material.
Use only materials listed below for vent pipe, intake air
pipe, and fittings. Failure to comply could result in death
or serious injury.
!
WARNING
Do not use cellular core pipe. Only specified sized
pipes are to be used. When using venting material
other than boiler manufacturer's venting, note the
correct installation procedure. Failure to follow these
instructions could result in death, or serious injury.
!
WARNING
• Covering non-metallic vent pipe and fittings with
thermal insulation shall be prohibited.
• Use of cellular core PVC for venting flue gas could
result in death, or serious injury.
• Coaxial venting shall be fastened with screws. Dual
flue venting is NOT fastened with screws.
!
1.
Venting shall be properly supported.
2.
Boiler shall not support any type of vent system.
3.
All piping, glue, solvents, cleaners, fittings and
components must conform to ASTM and ANSI standards.
In Canada ULC S636 and in the USA UL 1738 schedule 40
CPVC are the only approved vent system to be used as an
alternative to polypropylene venting for the exhaust pipe.
4.
Manufacturer requires use of a mechanical fastener at
every
push-fit gasket connection when using a single wall
polypropylene vent system.
Approved Polypropylene Manufacturers
* Natalini
* DuraVent
®
*Centrotherm
* Z-Flex
®
Note: Maximum equivalent length may vary between
manufacturers.
PN 240012369, REV A [08/31/2018]
