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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)
Orifice at sea level 2000
Natural Gas
Front
53
Middle
52
Rear
38
Propane
Front
66
Middle
63
Rear
53
March 2000
GB 40 I - FIREPLACE INSERT
HIGH ALTITUDE OPERATION
3000
4000
5000
54
54
54
54
52
53
53
53
39
40
41
41
67
67
68
68
64
64
65
65
54
54
54
54
6000
7000
8000
9000 10000
54
54
55
55
53
53
54
54
42
42
43
43
68
69
69
69
65
66
66
67
54
54
55
55
55
54
44
70
68
55
Page 11
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