AIR FOR

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

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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Desa CGD3924N Ventilation AIR, Tion and ventilation air by one of the methods described, Ventilation Air From Outdoors