Ventilation AIR

3. Add the Btu/Hr of all fuel burning appliances in the space.

Vent-free heater

Btu/Hr

Gas water heater*

Btu/Hr

Example:

Gas furnace

Btu/Hr

Gas

water

heater

40,000

Btu/Hr

Vented gas heater

Btu/Hr

Vent

free

heater +

20,000

Btu/Hr

Gas Fireplace logs

Btu/Hr

Total

60,000

Btu/Hr

Other gas appliances* +

Btu/Hr

Total

Btu/Hr

*Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors.

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 : 51,200 Btu/Hr(maximum the space can support) 60,000 Btu/Hr(actual amount of Btu/Hr used)

The space in the above 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 additional fresh. Your options are as follows:

A. Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined

space, remove door	to	adjoining	room	or	add	ventilation	grills	between rooms. See Ventilation Air From
inside Building, page	5.
B. Vent room directly to		the outdoors. See			Ventilation Air From Outdoors, page 6 .
C. Install a lower Btu/Hr		heater, 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 unconfined space. You will need no additional fresh air ventilation.

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/ANS Z223.1. Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts

WARNING: Rework worksheet, add- ing the space of the adjoining unconfined space. The combined spaces must have enough fresh air to supply all appliances in both spaces.

Figure 2 -Ventilation Air from Inside Building

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