Desa Fresh Air, Combustion, Ventilation, in your home, Unusually Tight Construction, Continued

FRESH AIR
	WARNING ICONG 001WARNING
FOR	This heater must have fresh air for proper operation. If not, poor
COMBUSTION	fuel combustion could result. Read the following instructions to
	insure proper fresh air for this and other fuel-burning appliances
AND
	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.
	PRODUCING ADEQUATE 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 8 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 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 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 addi-
	tional fresh air. See Ventilation Air From Outdoors, page 8.
	If your home does not meet all of the three criteria above, continue reading.
	Unconfined Space
	An unconfined space has a minimum air volume of 50 cubic feet for each 1000
	BTU/Hr input rating of all appliances in the space (cubic feet equals length x
	width x height of space). Include adjoining rooms only if there are doorless
	passageways or ventilation grills between the rooms.
	Confined Space
	A confined space has an air volume of less than 50 cubic feet for each 1000
	BTU/Hr input rating of all appliances in the space (cubic feet equals length x
	width x height of space). Include adjoining rooms only if there are doorless
	passageways or ventilation grills between the rooms.
		Continued	5

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