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SECTION 8: VENTING
35
SECTION 8: VENTING
8.1 General Venting Requirements
This heater must be vented in accordance with the
rules contained in this manual and with the following
national codes and any state, provincial or local
codes which may apply:
United States: Refer to National Fuel Gas Code
NFPA 54/ANSI Z223.1 - latest revision.
Canada: Refer to Natural Gas and Propane
Installation Code CSA B149.1 - latest revision.
Exhaust end of heater will accept a 4'' (10 cm) vent
pipe using the vent adapter (P/N 90502700). To
prevent leakage of condensation, install the vent
adapter with the seam on top and seal the joint using
a high temperature silicone sealant.
All vent joints should be sealed using suitable
product such as General Electric RTV106 or
Permatex Form-a-Gasket red high temperature
silicone adhesive sealant.
FIGURE 21: Outdoor Vent Cap Installation
For outdoor installations, vent caps must be installed
at inlet and fl
ue end. (See Page 37, Section 8.7).
Any portion of vent pipe passing through a
combustible wall must have an approved thimble
to conform with the above listed codes.
Vent pipe must be sloped downward away from the
burner 1/2'' (1 cm) for every 20' (6 m).
The heater may be individually vented or common
vented. When venting horizontally, a maximum of two
heaters can be commonly vented. See Page 39,
Section 8.10. When venting vertically, a maximum of
four heaters can be commonly vented. See Page 40,
Section 8.11.
The heater may also be installed unvented in certain
circumstances according to building ventilation
codes. Refer to the above codes and Page 36,
Section 8.2 for further information. Unvented
operation also requires compliance w
ith the
clearances to combustibles given on Page 10, Figure
12.
The bottom of the vent or air intake terminal shall not
be located less than 1' (.3 m) above grade level.
The vent shall not terminate less than 7' (2.1 m)
above grade where located adjacent to public
walkways.
Vent terminal must be installed at a height sufficient
to prevent blockage by snow, and building materials
protected from degradation by flue gases.
Secure all joints with #8 x 3/8 sheet metal screws.
Seal all joints with high temperature silicone sealant.
Vent terminal must be beyond any combustible
overhang.
WARNING
Carbon Monoxide Hazard
Heaters installed unvented must be interlocked
with sufficient building exhaust.
Heaters must be installed according to the
installation manual.
Failure to follow these instructions can result
in death or injury.
WARNING
Cut/Pinch Hazard
Wear protective gear during installation,
operation and service.
Edges are sharp.
Failure to follow these instructions can result
in injury.
Burner
Vent Cap
Apply
Silicone
Sealant