Vanguard Heating VS30PR Air For, Combustion, Ventilation Air From Outdoors, Continued

AIR FOR	WARNING
COMBUSTION
	If the area in which the heater may be operated is smaller than that defined as an uncon-
AND
	fined space, provide adequate combustion and ventilation air by one of the methods
VENTILATION
	described in the 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 uncon- fined 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

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 permanent 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 thermostat-controlled power vent. Heated air entering the attic will activate the power vent.

Ventilated

Outlet Attic

Air

Outlet
Air	To Attic

To

Crawl

Space

Inlet

Air

Inlet Air	Ventilated
	Crawl Space

Figure 3 - Ventilation Air from Outdoors

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