Superior Fireplaces VRT4032ZMN Installation And Operation Instructions Manual page 7

DETERMINING FRESH-AIR FLOW FOR
FIREPLACE LOCATION
Determining if You Have a Confi ned or
Unconfi ned Space Using the Standard Method
Use this work sheet to determine if you have a
confi ned or unconfi ned space.
Space: Includes the room in which you will install
fireplace 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 20 ft. (length) x 16 ft. (width)
x 8 ft. (ceiling height) = 2,560 cu. ft. (volume of
space)
If additional ventilation to adjoining room is sup-
plied with grills or openings, add the volume of
these rooms to the total volume of the space.
2. Multiply the space volume by 20 to determine the
maximum Btu/Hr the space can support.
__________ (volume of space) x 20 = (Maximum
Btu/Hr the space can support)
Example: 2,560 cu. ft. (volume of space) x 20 =
51,200 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in
the space.
Vent-free fi replace
Gas water heater*
Gas furnace
Vented gas heater
Gas fi replace logs
Other gas appliances*
Total
* Do not include direct-vent gas appliances. Direct-
vent draws combustion air from the outdoors and
vents to the outdoors.
Example:
Gas water heater
Vent-free fi replace
Total
126868-01D
AIR FOR COMBUSTION AND VENTILATION
Continued
__________ Btu/Hr
__________ Btu/Hr
__________ Btu/Hr
__________ Btu/Hr
__________ Btu/Hr
+ _________ Btu/Hr
=_________ Btu/Hr
______________ Btu/Hr 40,000
+ _____________ Btu/Hr 33,000
= _____________ Btu/Hr 73,000
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4. Compare the maximum Btu/Hr the space can
support with the actual amount of Btu/Hr used.
_________ Btu/Hr (maximum the space can sup-
port)
_________ Btu/Hr (actual amount of Btu/Hr used)
Example: 51,200 Btu/Hr (maximum the space
can support)
73,000 Btu/Hr (actual amount of Btu/
Hr used)
The space in the example is a confi 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 unconfi ned
space, remove door to adjoining room or add
ventilation grills between rooms. See Ventilation
Air From Inside Building.
B. Vent room directly to the outdoors. See Ventilation
Air From Outdoors Page 8.
C. Install a lower Btu/Hr fi replace, if lower Btu/Hr size
makes room unconfi ned.
If the actual Btu/Hr used is less than the maximum
Btu/Hr the space can support, the space is an un-
confi ned space. You will need no additional fresh air
ventilation.
WARNING: If the area in which
the heater may be operated does not
meet the required volume for indoor
combustion air, combustion and
ventilation air shall be provided by
one of the methods described in the
National Fuel Gas Code, ANSI Z223.1/
NFPA 54, the International Fuel Gas
Code, or applicable local codes.
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