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8 43D0122
W
H
WARNING
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/NFPA54, Section 5.3 or applicable
local codes.
The following formula can be used to determine the maximum heater rating per the defi nition of unconfi ned space:
BTU/Hr = (L1 + L2) Ft x (W) Ft x (H) Ft
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)
50
GENERAL INSTALLATION INFORMATION
Figure 1 - Example of a Large Room with a See-Through Unit as 1/2 Wall Divider
Inside Wall
Fireplace
x 1000
x 1000 = 52800 BTU/Hr