Desa NATURAL GAS LOG HEATER installation manual AIR for, Combustion, Ventilation AIR

AIR FOR			WARNING ICONG 001	WARNING
COMBUSTION
		If the area in which the heater may be operated is smaller than
AND		that defined as an unconfined space, provide adequate combus-
		tion and ventilation air by one of the methods described in the
VENTILATION		National Fuel Gas Code, ANSI Z223.1, 1992, Section 5.3.
Continued	VENTILATION AIR
	Ventilation Air From Inside Building
	This fresh air would come from an adjoining unconfined space. When ventilating to an
	adjoining unconfined space, you must provide two permanent openings: one within 12" of the
	ceiling and one within 12" of the floor on the wall connecting the two spaces (see options 1 and
	2, Figure 2). You can also remove door into adjoining room (see option 3, Figure 2). Follow
	the National Fuel Gas Code NFPA 54/ANSI Z223.1, Section 5.3, Air for Combustion and
	Ventilation for required size of ventilation grills or ducts.
			WARNING ICONG 001	WARNING
		Rework worksheet, adding the space of the adjoining unconfined
		space. The combined spaces must have enough fresh air to supply all
		appliances in both spaces.
					12"
		Ventilation
						Ventilation Grills
		Grills
		Into Adjoining	Or			Into Adjoining Room,
		Room,				Option 2
			Remove
		Option 1
			Door into
			Adjoining
			Room,
			Option
			3
				12"

Figure 2 - Ventilation Air from Inside Building

Ventilation Air From Outdoors

Provide extra fresh air by using ventilation grills or ducts. You must provide two perma- nent openings: one within 12" of the ceiling and one within 12" of the floor. Connect these items directly to the outdoors or spaces open to the outdoors. These spaces include attics and crawl spaces.

IMPORTANT: Do not provide openings for inlet or outlet air into attic if attic has a thermo- stat-controlled power vent. Heated air entering the attic will activate the power vent.

	Outlet	Ventilated
		Attic
	Air
Outlet
Air		To Attic
		To
		Crawl
Inlet		Space
Air
	Inlet Air	Ventilated
		Crawl Space
Figure 3 - Ventilation Air from Outdoors			7

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