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Improved construction and additional insulation in buildings
helped in reducing heating/cooling costs but have created
a problem supplying combustion and ventilation air for
there is an adequate supply of combustion and ventilation
CSA B149 Installation Codes or applicable provisions of
the local building codes for determining the combustion air
This furnace must use indoor air for combustion. It cannot
be installed as a direct vent (i.e., sealed com bustion)
furnace.
furnace area by means of ventilation grilles or ducts
connecting directly to the outdoors or spaces open to the
intake pipe instead of relying on the louvers for combustion
furnace vented as Category I is considered a fan-assisted
appliance and the vent system does not have to be “gas
When an existing
furnace is removed from a venting system serving other
appliances
Furnaces
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