Operating instructions

10 33D4051
GENERAL INSTALLATION INFORMATION
Figure 3 - Sample Room for Determining the Maximum Heater Rating
WARNING
If the area in which the heater may be operated is smaller than that dened as an
uncon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, 1992, Section 5.3 or applicable local codes.
Thefollowingformulacanbeusedtodeterminethemaximumheaterratingperthedenitionofunconned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:
L1 = 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