User Guide

www.fmiproducts.com
124970-01A 7
DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION


Use this work sheet to determine if you have
a conned or unconned 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 22 ft. (length) x 18
ft. (width) x 8 ft. (ceiling height) = 3168 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. Multiply the space volume by 20 to deter-
mine the maximum Btu/Hr the space can
support.
_____ (volume of space) x 20 = (Maxi-
mum Btu/Hr the space can support)
Example: 3168 cu. ft. (volume of space) x
20 = 63,360 (maximum Btu/Hr the space
can support)
3. Add the Btu/Hr of all fuel burning appli-
ances in the space.
Vent-free heater _______ Btu/Hr
Gas water heater* _______ Btu/Hr
Gas furnace _______ Btu/Hr
Vented gas heater _______ Btu/Hr
Gas replace logs _______ Btu/Hr
Other gas appliances* + ______ Btu/Hr
Total = ______ Btu/Hr
* Do not include direct-vent gas appli-
ances. Direct-vent draws combustion
air from the outdoors and vents to the
outdoors.
Example:
Gas water heater _________ Btu/Hr
Vent-free heater + ________ Btu/Hr
Total = ________ Btu/Hr
AIR FOR COMBUSTION AND VENTILATION
Continued
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: 63,360 Btu/Hr (maximum the
space can support)
79,000 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 sup-
port. 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 8.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors, page 8.
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.
WARNING: If the area in which


-


  National Fuel
Gas Code, ANSI Z223.1/NFPA 54,
the International Fuel Gas Code,

40,000
39,000
79,000