Determining Fresh-Air Flow For Heater Location - Desa Comfort Glow CGP10TLA Owner's Operation And Installation Manual

OWNER'S MANUAL
AIR FOR
COMBUSTION AND
VENTILATION
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DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if You Have a Confined or Unconfined Space
Use this worksheet to determine if you have a confined or unconfined 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 x width x height).
Length x Width x Height = cu. ft. (volume of space)
Example: Space size 18 ft. (length) x 16 ft. (width) x 8 ft. (ceiling heigh 0 = 2304 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: 2304 cu. ft. (volume of space) + 50 cu. ft. = 46.1 or 46,100 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in the space,
Vest-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 + 10,000 Btu/Hr
Gas fireplace logs Btu/Hr Total = 50,000 Btu/Hx
Other gas appliances* + Btu/Hr
Total = Bto/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 BttffHr 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: 46,100 Btu/Hr (maximum the space can support)
50,000 Bto/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 max'maum Btu/Hr the space can support.
You must provide additional fresh air. Your options are as follows:
A, Rework worksbeet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoin-
ing room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 6.
B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 6.
C. lustall a lower Bto/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.
I Ak WARNING: ifthe area in which the heater may be operated is smaller than that defined asen uncenflned space,
provide adequate combustion and ventilation sir by one of the methods described in the NatIonalFuel Gas Code,
ANSI Z223.1, 1992, Section 5.3 or applicable local codes.
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