Local Codes, Air For Combustion And Ventilation

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 1-800-463-6727 (call your local gas company for your local codes).

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 fuel-burning appliances need fresh air for proper combustion and ventilation.

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 fuel-burning appliances.

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 10-11kg per pa-sec-m2) or less with open- ings gasketed or sealed and

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 wall-ceiling joints, between wall pan- els, at penetrations for plumbing, electrical, and gas lines, and at other openings.

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 Fresh-Air Flow For Heater Location, page 5.

Confined and Unconfined Space

The Canadian Gas Association Certification Requirement, CGA CR94-001 REV. 2 states that when combustion air supply is for the unvented room heater only, it shall be sized at the rate of one (1) square inch per 5000 BTU/HR (1.5 KW) from outdoors or the manufacturer’s specification (whichever is greater). However, com- bustion air is acceptable when available from the principal heat source and sized to the current CAN/CGA-B149.1 or .2 require- ments. Where unvented equipment is installed in an area separated from a combustion air supply by a door, then permanent openings, grills or louvers shall be provided. One shall be within 18 inches (46 cm) from the ceiling and one 18 inches (46 cm) from the floor, sized to one (1) square inch per 1000 BTU/HR (0.29 KW) to allow free movement of air with the source of combustion air supply.

visit www..com