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8 81D0107
W
H
The following formula can be used to determine the maximum heater rating per the definition of unconfined space:
BTU
/Hr =
(L1 + L2) Ft x (W) Ft x (H) Ft.
x 1000
BTU
/Hr
50
Consider two connecting rooms with an open area between, with the following dimensions:
L
1 = 15
1
/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
BTU
/Hr =
(15
1
/2 + 12) x (12) x (8)
x 1000 = 52800
BTU
/Hr
50
If there were a door between the two rooms the calculation would be based only on the room with the heater.
BTU
/Hr =
(15
1
/2) x (12) x (8)
x 1000 = 29760
BTU
/Hr
50
GENERAL INSTALLATION INFORMATION
Figure 1 - Example of a Large Room with 1/2 Wall Divider
Counter
Fireplace
If the area in which the heater may be operated is smaller than that defi ned as an
unconfi ned 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, Section 5.3 or applicable local codes.
WARNING