Page 11
March 2000
GB 40 I - FIREPLACE INSERT
HIGH AL
TITUDE
Orifice at sea level 2000
3000
4000
5000
6000
7000
8000
9000
10000
Natural Gas
Front
53
54
54
54
54
54
54
55
55
55
Middle
52
52
53
53
53
53
53
54
54
54
Rear
38
39
40
41
41
42
42
43
43
44
Propane
Front
66
67
67
68
68
68
69
69
69
70
Middle
63
64
64
65
65
65
66
66
67
68
Rear
53
54
54
54
54
54
54
55
55
55
HIGH ALTITUDE OPERATION
For installations in the United States and at altitudes above 2000 feet, the appliance input shall be adjusted
in accordance with local codes or, in the absence of any, follow the current ANSI Z223.1, National Fuel
Gas Code. For installation in Canada for altitudes up to 4500 feet, for altitudes above 4500 feet, contact
the authority having jurisdiction, or the manufacturer. Follow local codes or CAN 1 B-149.
NOTE: In the United States, input ratings of this unit are based on sea level operation, and shall not be
changed for operation at elevations up to 2000 feet (600m). For operation at elevations above
2000 feet, this appliance shall be reduced at the rate of 4% for each 1000 feet above sea level.
Exception: As permitted by the authority having jurisdiction.
EQUIVALENT ORIFICE SIZES AT HIGH ALTITUDES
(INCLUDES 4% INPUT REDUCTION FOR EACH 1000 FEET)
