United States Stove 2020N User Manual download pdf (Page 8)

AIR FOR COMBUSTION AND VENTILATION

CONTINUED

Determining if Determining if

Determining if

ou Haou Ha

ou Ha

ve a Confined or Unconfined Spaceve a Confined or Unconfined Space

ve a Confined or Unconfined Space

Use this worksheet to determine if you have a confined or unconfined space.

Space: Space:

Space: Includes the room in which you will install the firebox plus any adjoining rooms with

doorless passageways or ventilation grills between the rooms.

1. Determine the volume of the space (length x width x height).

Length x Width x Height = _______________ cu. Ft. (volume of space)

Example:

Space size 22 ft. (length) x 18 ft. (width) x 8 ft. (ceiling height) =

3168 cu. Ft. (volume of space)

If additional ventilation to adjoining room is supplied with grills or openings, add the

volume of these rooms to the total volume of the space.

2. Divide the space volume by 50 cubic feet to determine the maximum BTU/Hr the space

can support.

_________ (volume of space) 50 cu. Ft. = (Maximum BTU/Hr the space can support)

Example:

3168 cu. Ft. (volume of space) 50 cu. Ft. = 63.3 or 63,300 (maximum

BTU/Hr the space can support)

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

Vent-free Firebox __________________ BTU/Hr

Gas water heater* __________________ BTU/Hr

Gas furnace __________________ BTU/Hr

Vented gas heater __________________ BTU/Hr

Gas firebox logs __________________ BTU/Hr

Other gas appliances* + __________________ BTU/Hr

Total = __________________ BTU/Hr

Example:

Gas water Heater 40,000 BTU/Hr

Vent-free firebox with log heater + 39,000 BTU/Hr

Total = 79,000 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: 63,300 BTU/Hr (maximum the space can support)

79,000 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

air.

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 9.

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United States Stove 2020N User Manual Page 8

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