Ventilation AIR, Ventilation Air From Outdoors

AIR FOR COMBUSTION

AND VENTILATION

Continued

	Example:	40,000
	Gas water heater	40,000
	Gas water heater	_____________ Btu/Hr
	Vent-free ﬁreplace	33,000
	Vent-free ﬁreplace	+____________ Btu/Hr
	Total	73,000
	Total	=____________ Btu/Hr

4.Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.

_________Btu/Hr (maximum the space can support)

_________Btu/Hr (actual amount of Btu/Hr used)

Example: 57,600 Btu/Hr (maximum the space can support)

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining un- conﬁned space. When ventilating to an adjoining unconﬁned space, you must provide two perma- nent 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 3). You can also remove door into adjoining room (see option 3, Figure 3). Follow the National Fuel Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts.

73,000 Btu/Hr (actual amount of Btu/Hr used)

The space in the example is a conﬁned space because the actual Btu/Hr used is more than the maximum Btu/Hr the space can support. You must provide ad- ditional fresh air. Your options are as follows:

A. Rework worksheet, adding the space of an adjoin-

ing room. If the extra space provides an unconﬁned

	Ventilation
	Grills
	Into Adjoining	Or
	Room,	Or
	Room,	Remove
	Option 1	Remove
	Option 1	Door into
		Door into
		Adjoining
		Room,
		Option
		3

12"

Ventilation Grills

Into Adjoining Room,

Option 2

space, remove door to adjoining room or add

ventilation grills between rooms. See Ventilation

Air From Inside Building.

B. Vent room directly to the outdoors. See Ventila-

tion Air From Outdoors.

C. Install a lower Btu/Hr ﬁreplace, if lower Btu/Hr

size makes room unconﬁned.

If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an un- conﬁned space. You will need no additional fresh air ventilation.

WARNING: If the area in which the heater may be oper- ated is smaller than that deﬁned as an unconﬁned space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1/NFPA54 Section 5.3 or applicable local codes.

12"

Figure 3 - 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. Follow the National Fuel Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts.

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.

	Outlet	Ventilated
	Outlet	Attic
	Air	Attic
	Air
Outlet
Air		To Attic
		To Attic
		To
		Crawl
Inlet		Space
Inlet
Air
	Inlet Air	Ventilated
	Inlet Air	Crawl Space
		Crawl Space

Figure 4 - Ventilation Air from Outdoors

113134-01B

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VTGF33NRB, VTGF33PRB specifications

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Overall, the Desa VTGF33PRB and VTGF33NRB are exemplary models that showcase the harmonious blend of efficiency, safety, and design. Their advanced features and technologies make them reliable choices for anyone looking to enhance their heating solutions while maintaining comfort and style. With their commitment to quality and innovation, Desa continues to lead the way in the heating industry.

Desa VTGF33NRB, VTGF33PRB installation manual Ventilation AIR, Ventilation Air From Inside Building

Models: VTGF33NRB VTGF33PRB