Non-Direct Vent Furnace Installations Using Indoor Combustion Air (One Pipe System); Determining Combustion Air; Case 1: Furnace Located In A Unconfined Space - Napoleon WPV-N Série Instructions D'installation Et D'opération

8.0 NON-DIRECT VENT FURNACE INSTALLATIONS USING
INDOOR COMBUSTION AIR (ONE PIPE SYSTEM)
The furnace, although designed as a direct vent type appliance, may be installed with the intake vent inside the
structure.
THIS FURNACE AND ANY OTHER FUEL BURNING APPLIANCE MUST BE PROVIDED
WITH ENOUGH FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF THE
FLUE GASES. MOST HOMES WILL REQUIRE THAT OUTSIDE AIR BE BROUGHT TO
THE FURNACE AREA. FAILURE TO DO SO CAN CAUSE PERSONAL INJURY, OR DEATH
Adequate provisions for combustion and ventilation air must be in accordance with CAN/CGA-B149 in Canada,
and ANSI Z223.1 - 2018, section "Air for Combustion and Ventilation," in the United States. Check with local
authorities for any additional building codes bylaws or regulations.
AIR FOR COMBUSTION AND VENTILATION PURPOSES MUST NOT ORIGINATE FROM A
CORROSIVE ATMOSPHERE. ANY FURNACE FAILURE CAUSED BY CORROSIVE ELEMENTS IS
The following types of installation sites (but not limited to the following) will REQUIRE OUTDOOR AIR for
combustion because of chemical exposures:
• Commercial buildings
• Buildings with indoor swimming pools
• Furnaces installed in laundry rooms
• Furnaces in hobby or craft rooms
• Furnaces installed near chemical storage areas
Combustion air must be free of acid forming chemicals such as sulphur, fl uorine and chlorine. These elements
are found in aerosol sprays, detergents, bleaches, cleaning solvents, air fresheners, paint and varnish
removers, refrigerants, and many other commercial and household products. When burned in a gas fl ame,
vapors from these products form acid compounds. Acid compounds increase the dew point temperature of the
fl ue products and are highly corrosive after they condense.
8.1

DETERMINING COMBUSTION AIR

8.1.1 CASE 1: FURNACE LOCATED IN A UNCONFINED SPACE

Unconfi ned space does not necessarily mean that ventilation will not have to be introduced from the outdoors,
particularly in airtight homes. The minimum requirement for unconfi ned space is a volume of 50 cubic feet (1.42
m³) for each 1000 Btu/hr for all fuel burning appliances located within the unconfi ned area.
If the amount of combustion and ventilation air is insuffi cient to properly operate the furnace and other fuel
burning appliances within the unconfi ned area, it will be necessary to supply it from the outdoors based on the
criteria used when calculating the air supply for a confi ned space.
NOTE
If planning to use the inside air in an unconfi ned space, remember to test for proper furnace operation (as well
as other fuel burning appliances located within the unconfi ned space) with respect to adequate combustion and
ventilation air with fi replace dampers open, clothes dryer running, bathroom exhaust fans on, kitchen range hood
on, etc.
WARNING
!
FROM CARBON MONOXIDE POISONING.
CAUTION
!
EXCLUDED FROM WARRANTY COVERAGE.
!
H3.11
!
H13.0A
H13.1
W415-2308 / B / 11.04.19
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IOM