AGVF340N User Manual

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

Length x Width x Height = _____________cu.ft.(volume of space)

EXAMPLE: 20 ft.(Length) x 16 ft.(Width) x 8 ft.(ceiling Height)= 2560 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: 2560 cu. ft. (volume of space /50 cu. Ft .= 51.2 or 51200 (maximum BTU/Hr the space can

support)

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

Example:

Gas water heater 400000 BTU/Hr

Vent-free heater + 18000BTU/Hr

total = 58000 BTU/Hr

*Does not include direct-vent gas

appliances. Direct-vent draws

combustion air from outdoors and

vents to the outdoors.

Vent-free heater BTU/Hr __________ BTU/Hr

*Gas water heater BTU/Hr __________ BTU/Hr

Gas furnace BTU/Hr __________ BTU/Hr

Vented gas heater BTU/Hr __________ BTU/Hr

Gas replace logs BTU/Hr __________ BTU/Hr

Other gas appliance BTU/Hr +__________ BTU/Hr

Total =__________ BTU/Hr

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

_____________ BTU/Hr (maximum the space can support)

_____________ BTU/Hr (actual amount of BTU/Hr used)

Example: 51200 BTU/Hr (maximum the space can support)

58000 BTU/Hr (actual amount of BTU/Hr used)

Space in above example is unusually tight construction because actual BTU/Hr used is more than

maximum BTU/Hr the space can support. You must provide additional fresh air. Your options are as

follows:

A. Rework worksheet, adding space of an adjoining room. If extra space provides an unconned space,

remove door to adjoining room or add ventilation grills between rooms (see “Air For Combustion And

Ventilation Inside Building” section of this manual).

B. Vent room directly to the outdoors (see “Air For Combustion And Ventilation Outdoors” section of this

manual).

C. Install a lower BTU/Hr heater, if lower BTU/Hr size makes room unconned.

If actual BTU/Hr used is less than the maximum BTU/Hr the space can support, space is an unconned

space. You will need no additional fresh air ventilation.

WARNING: YOU MUST PROVIDE ADDITIONAL VENTILATION AIR IN UNUSUALLY TIGHT

CONSTRUCTION.

VENTILATION

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Ashley AGVF340N 1,200 Sq. Ft. Single-Burner Vent Free Natural Gas Stove