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Date: 8-4-2010
Revision: 0
Form: 2396
Combustion Air Supply Dampers, Louvers,
and Grilles
The free area of the combustion air supply
opening shall be calculated by subtracting the
blockage area of all fixed louvers, grilles or
screens from the gross area of the opening.
Openings in a fixed louver, grille, or screen shall
have no dimension smaller than ¼” (6 mm).
No manually operated damper or manually
operated adjustable louvers are permitted.
A motorized damper or louvers shall be
interlocked so the burner(s) cannot operate
unless the damper or louver is in the fully open
position.
Mechanical Combustion Air Supply
When combustion air is supplied by mechanical
means, an airflow sensing device shall be
installed and wired into the safety limit circuit of
the primary safety control to shut off the gas in
the even a an air supply failure.
Appliance Venting per CAN/CSA-B149.1-
05
Paragraph 8.9 of CAN/CSA-B149.1-05 addresses
“Appliance Venting”. Paragraphs 8.9 through 8.31
address many facets of flue gas vents, many of which
do not apply to the Triple-Flex boiler, which is a
Category IV listed appliance requiring the use of
special venting systems as previously described.
NOTE:
Please note that the information provided in this
manual relative to the Canadian Standard is not
meant to be all-inclusive. Reading the entire
Standard is strongly suggested. The final
approval of all system designs must be
acceptable to the authority having jurisdiction.
• Venting for Category IV appliances shall
be as specified or furnished by the
manufacturer of the listed appliance.
The Triple-Flex boiler is a Category IV
appliance requiring the use of special
vent that is certified.
• A special venting system shall be
installed in accordance with the terms of
it’s listing and the vent manufacturers
certified installation manual.
• A flue gas vent or a vent connector shall
not be installed in either a duct or a
shaft used for return air, hot air,
ventilating air, or combustion air.
• An appliance that operates at a positive
vent pressure shall not be connected to
a venting system serving any other
appliance. The Triple-Flex boiler
operates at a positive vent pressure.
• A factory-built chimney used for venting
an appliance shall be certified.
Vent Sizing
• A vent or chimney serving a single
appliance shall provide effecting venting
and shall be sized so that it’s effective
area is not less than that of the flue
outlet diameter of the boiler and in
accordance with engineering venting
tables acceptable to the authority having
jurisdiction.
• A vent or chimney serving more than
one appliance shall provide effective
venting and shall be sized in
accordance with good engineering
practice, such as by the use of
engineering venting tables acceptable to
the authority having jurisdiction.
1.7.3 MARKING OF GAS VENTS
Where solid and liquid fuels are used, gas vents,
must be plainly and permanently identified by a
label. The label should read, "This gas vent is
for appliances that burn gas only. Do not
connect to incinerators or solid or liquid fuel
burning appliances."
This label must be attached to the wall or ceiling
at a point near where the gas vent connector
enters the wall, ceiling or chimney.
The authority having jurisdiction must determine
whether their area constitutes such a locality.
Solid Fuel Appliance Vents
Gas appliances shall not be vented to a vent or
a chimney that serves a solid-fuel burning
appliance.
8
1.8 BEFORE PLACING BOILER IN
OPERATION