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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 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 confined 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:
Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined
space,
a) Remove door to adjoining room or add ventilation grills between rooms. See “Ventilation Air From
Inside Building ” on next page.
b) Vent room directly to the outdoors. See “Ventilation Air From Outdoors ” on next page.
c) Install a lower BTU/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.
WARNING:
If the area in which the heater may be operated is smaller than that defined as an
unconfined space or if the building is of unusually tight
construction, provide adequate combustion and ventilation air by
one of the methods described in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54. Air for Combustion and Ventilation, or applicable
local codes.
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.
Ventilation Air From lnside Building
This fresh air would come from an adjoining
unconfined space.
When ventilating to an adjoining unconfined
space, you must provide two permanent
openings: one within 12 inches of the ceiling and one within 12 inches of the floor on the wall connecting
the two spaces (see options 1 and 2, Figure 3). You can also remove the door into adjoining room (see
option 3, Figure 3). Follow the National Fuel Gas Code. ANSI Z223.1/NFPA 54, Air for Combustion and
Ventilation for required size of ventilation grills or ducts.
Figure 3 - Ventilation Air from Inside Building
NOTE: Base not included. Not for use in bedrooms or bathrooms.
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