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DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

Determining if You Have a Conned or Unconned Space

Use this worksheet to determine if you have a conned or unconned space.

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

doorless passageways or ventilation grills between the rooms.

1. Determine the volume of the space Length × Width × Height = cu. ft. (volume of space)

Example: Space size 20 ft. (length) × 16 ft.(width) × 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 cu. ft. 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 51,200 (maximum

BTU/hr the space can support)

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

Vent-free heater _________ BTU/hr

Gas water heater* ________BTU/hr

Gas furnace _____________BTU/hr

Vented gas heater ________BTU/hr Example:

Gas heater logs __________BTU/hr Gas water heater 30,000 BTU/hr

Other gas appliances*+ ____BTU/hr Vent-free heater + 26,000 BTU/hr

Total = ____BTU/hr Total = 56,000 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 : 51,200 BTU/hr (maximum the space can support)

56,000 BTU/hr (actual amount of BTU/hr used)

The space in the above example is a conned 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 unconned space, remove door to adjoining room or add ventilation

grills between rooms. See “Ventilation Air From Inside Building,” page 10.

b) Vent room directly to the outdoors. See “Ventilation Air From Outdoors”, Page 10.

c) Install a lower BTU/hr heater if lower BTU/hr size makes room unconned. If the

actual BTU/hr used is less than the maximum BTU/hr the space can support, the

space is an unconned space. You will need no additional fresh air ventilation.

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Procom MD300HGA Spezifikationen Seite 9