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NOTICE
SOME AREAS IN THE UNITED STATES HAVE HIGHER
REQUIREMENTS FOR CUBIC FEET PER 1000 BTU/ HOUR
INPUT. (EX. CINCINNATI, OHIO CODES REQUIRE 70 CUBIC
FEET). CHECK YOUR LOCAL CODE BEFORE INSTALLA-
TION.
DETERMINING FRESH-AIR FLOW FOR
HEATER LOCATION
DETERMINE IF YOU HAVE A CONFINED OR UNCONFINED SPACE.
Use this worksheet to determine if you have confined or unconfined space.
SPACE: Includes the room in which you install the heater plus 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: 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.
Vent-free Heater __________________BTU/Hr
Gas Water Heater* __________________BTU/Hr
Gas Furnace __________________BTU/Hr
Vented Gas Heater __________________BTU/Hr
Gas Fireplace Logs __________________BTU/Hr
Other Gas Appliances* + __________________BTU/Hr
TOTAL = __________________BTU/Hr
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