AIR FOR COMBUSTION AND VENTILATION

5

Determining Fresh-Air Flow For Heater Location (Cont.)

Ventilation Air

 

 

 

AIR FOR COMBUSTION AND

VENTILATION AIR

VENTILATION

 

Ventilation Air From Inside Building

Continued

 

 

This fresh air would come from an adjoining unconfined space.

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

When ventilating to an adjoining unconfined space, you must

provide two permanent openings: one within 12" of the ceiling and

 

Vent-free heater

 

_____________ Btu/Hr

one within 12" of the floor on the wall connecting the two spaces

 

Gas water heater*

 

_____________ Btu/Hr

(see options 1 and 2, Figure 2). You can also remove door into

 

Gas furnace

 

_____________ Btu/Hr

adjoining room (see option 3, Figure 2). Follow the National Fuel

 

Vented gas heater

 

_____________ Btu/Hr

Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion

 

Gas fireplace logs

 

_____________ Btu/Hr

and Ventilation for required size of ventilation grills or ducts.

 

 

 

 

 

 

 

 

Other gas appliances* +

_____________ Btu/Hr

 

 

 

 

 

 

 

 

 

 

 

 

Total

=

_____________ Btu/Hr

 

 

12"

 

 

* Do not include direct-vent gas appliances. Direct-vent draws com-

 

 

 

 

 

 

bustion air from the outdoors and vents to the outdoors.

 

 

 

Ventilation Grills

 

Example:

 

 

 

 

 

 

 

 

Ventilation

 

 

Into Adjoining Room,

 

Gas water heater

 

40,000

Or

 

Option 2

 

 

Grills

 

 

 

 

 

_____________ Btu/Hr

into Adjoining

Remove

 

 

 

 

 

 

10,000

 

 

 

 

Vent-free heater

+

Room,

Door into

 

 

 

 

_____________ Btu/Hr

Option 1

Adjoining

 

 

 

 

Total

=

50,000

 

Room,

 

 

 

 

_____________ Btu/Hr

 

Option 3

 

 

 

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)

 

 

 

 

 

 

 

 

 

 

 

 

 

12"

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

Example: 51,200 Btu/Hr (maximum the space can support)

 

 

 

 

 

 

50,000 Btu/Hr (actual amount of Btu/Hr used)

 

 

 

 

 

The space in the above example is a confined space because the actual Btu/

Figure 2 - Ventilation Air from Inside Building

Hr used is more than the maximum Btu/Hr the space can support. You must

Ventilation Air From Outdoors

provide additional fresh air. Your options are as follows:

A.

Rework worksheet, adding the space of an adjoining room. If the ex-

Provide extra fresh air by using ventilation grills or ducts. You must

 

 

 

 

tra space provides an unconfined space, remove door to adjoining

provide two permanent openings: one within 12" of the ceiling and

room or add ventilation grills between rooms. See Ventilation Air From

one within 12" of the floor. Connect these items directly to the

Inside Building.

outdoors or spaces open to the outdoors. These spaces include attics

 

B.Vent room directly to the outdoors. See Ventilation Air From and crawl spaces. Follow the National Fuel Gas Code, ANSI Z223.1/

Outdoors.

NFPA 54, Section 5.3, Air for Combustion and Ventilation for

C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room un-

required size of ventilation grills or ducts.

confined.

IMPORTANT: Do not provide openings for inlet or outlet air into

If the actual Btu/Hr used is less than the maximum Btu/Hr the space can

attic if attic has a thermostat-controlled power vent. Heated air

support, the space is an unconfined space. You will need no additional fresh

entering the attic will activate the power vent.

air ventilation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WARNING: If the area in which the heater may be operated is smaller than that defined as an uncon- fined space or if the building is of unusually tight construction, provide adequate combustion and ven- tilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1/NFPA 54, Sec- tion 5.3 or applicable local codes.

 

 

 

 

Outlet

Ventilated

 

 

 

 

Attic

 

 

 

 

Air

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outlet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Air

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To Attic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Crawl

Inlet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Space

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Air

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Inlet Air

 

 

Ventilated

 

 

 

 

 

 

 

Crawl Space

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 3 - Ventilation Air from Outdoors

For more information, visit www.desatech.com

110720-01A

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Desa VP600BA, VN600BA, VN1000BTA, VP1000BTA, VN10A, VP10A, VN6D, VP5D AIR for Combustion, Ventilation AIR
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