MHSC MJ27NR Installation And Operating Instructions Manual page 8

GENERAL INSTALLATION INFORMATION
The following formula can be used to determine the maximum heater rating per the definition of
unconfined space:
/
BTU
hr =
Consider two connecting rooms with an open area between, with the following dimensions:
BTU
If there were a door between the two rooms the calculation would be based only on the room
with the heater.
/
BTU
hr =
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, Section 5.3 or applicable local codes.
8
Figure 1 - Example of a Large Room with 1/2 Wall Divider
FP2000
log clearances
(L1 + L2) Ft x (W) Ft x (H) Ft.
50
1
L = 15 / Ft., L = 12 Ft., W = 12 Ft., H = 8 Ft.
1 2 2
/
1
(15 / + 12) x (12) x (8)
2
hr =
50
1
(15 / x (12) x (8)
2)
50
Counter
Fireplace
W
BTU
x 1000
x 1000 = 52800
BTU
x 1000 = 29760
H
/
hr
/
BTU
hr
/
hr
86D0024