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LOCAL CODES
AIR FOR COMBUSTION AND VENTILATION
Providing Adequate Ventilation
LOCAL CODES
Install and use heater with care. Follow all local codes. In the absence of local codes, use the latest edition of CAN/CGA B149.1 Natural Gas Installation Code or CAN/CGA B149.2 Propane Installation Code*.
*Available from www.csa.ca or
AIR FOR COMBUSTION AND VENTILATION
WARNING: This heater shall not be installed in a confined space or unusually tight construction un- less provisions are provided for adequate combus- tion and ventilation air. Read the following instruc- tions to insure proper fresh air for this and other fuel- burning appliances in your home.
Today’s homes are built more energy efficient than ever. New materi- als, increased insulation, and new construction methods help reduce heat loss in homes. Home owners weather strip and caulk around windows and doors to keep the cold air out and the warm air in. During heating months, home owners want their homes as airtight as possible.
While it is good to make your home energy efficient, your home needs to breathe. Fresh air must enter your home. All
Exhaust fans, fireplaces, clothes dryers, and fuel burning appliances draw air from the house to operate. You must provide adequate fresh air for these appliances. This will insure proper venting of vented
PROVIDING ADEQUATE VENTILATION
The following are excerpts from CAN/CGA B149.1 Natural Gas Installation Code or CAN/CGA B149.2 Propane Installation Code.
All spaces in homes fall into one of the three following ventilation classifications:
1.Unusually Tight Construction
2.Unconfined Space
3.Confined Space
The information on pages 4 through 6 will help you classify your space and provide adequate ventilation.
For more
Unusually Tight Construction
The air that leaks around doors and windows may provide enough fresh air for combustion and ventilation. However, in buildings of unusually tight construction, you must provide additional fresh air.
Unusually tight construction is defined as construction where:
a.walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of one perm (6 x
b.weather stripping has been added on openable windows and doors and
c.caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between
If your home meets all of the three criteria above, you must provide additional fresh air. See Ventilation Air From Out- doors, page 6.
If your home does not meet all of the three criteria above, proceed to Determining
Confined and Unconfined Space
The Canadian Gas Association Certification Requirement, CGA
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