Desa Tech CGN20TL, CGN30TL installation manual Fresh AIR For, Providing Adequate Ventilation

FRESH AIR	WARNING ICONG 001 WARNING
FOR	This heater shall not be installed in a confined space unless provi-
COMBUSTION	sions are provided for adequate combustion and ventilation air.
	Read the following instructions to insure proper fresh air for this
AND
	and other fuel-burning appliances in your home.
VENTILATION
	Today’s homes are built more energy efficient than ever. New materials, 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 is exerpts from National Fuel Gas Code. NFPA 54/ANSI Z223.1,
	Section 5.3, Air for Combustion and Ventilation.
	All spaces in homes fall into one of the three following ventilation classifications:
	1. Unusually Tight Contruction; 2. Unconfined Space; 3. Confined Space.
	The information on pages 5 through 7 will help you classify your space and provide
	adequate ventilation.
	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 continu- ous water vapor retarder with a rating of one perm (6x10-11per pa-sec- m2) or less with openings 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 panels, 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 Outdoors, page 8.

If your home does not meet all of the three criteria above, proceed to page 6.

Confined and Unconfined Space

The National Fuel Gas Code (ANSIZ2123.1, 1992 Section 5.3) defines a confined space as a space whose volume is less than 50 cubic feet** per 1,000 Btu per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 Btu per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed*, through openings not furnished with doors, are considered a part of the unconfined space.

*Adjoining rooms are communicating only if there are doorless passageways or ventilation grills between them.

** Cubic feet equals length x width x height of room. Continued 5

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