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Gas Requirements
M414038
38
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High Altitude Orifice Sizing
For proper operation at altitudes above 2000 feet
(610 meters), the gas orifice size must be reduced to
ensure complete combustion. For CE Marked models,
consult local gas supplier.
Table 6
Non-CE Marked Models
Model Gas
Altitude Orifice
New
Rate
feet m No. inches mm Quantity Part No. (Btu/hr)*
120FG
Natural
Gas
2001 – 4000 610 – 1220 14 0.1820 4.6
3
M411371 276,000
4001 – 6000 1221 – 1830 16 0.1770 4.5 M411373 252,000
6001 – 8000 1831 – 2440 17 0.1730 4.4 M411374 228,000
8001 – 10,000 2441 – 3050 19 0.1660 4.2 M402995 204,000
L.P.
Gas
2001 – 4000 610 – 1220 35 0.1100 2.8 M402487 276,000
4001 – 6000 1221 – 1830 36 0.1065 2.7 M411375 252,000
6001 – 8000 1831 – 2440 38 0.1015 2.6 M411376 228,000
8001 – 10,000 2441 – 3050 40 0.0980 2.5 M406361 204,000
170FG
Natural
Gas
2001 – 4000 610 – 1220 14 0.1820 4.6
4
M411371 363,400
4001 – 6000 1221 – 1830 16 0.1770 4.5 M411373 331,800
6001 – 8000 1831 – 2440 17 0.1730 4.4 M411374 300,200
8001 – 10,000 2441 – 3050 19 0.1660 4.2 M402995 268,600
L.P.
Gas
2001 – 6000 610 – 1830 30 0.1285 3.3
3
M401021 363,400
6001 – 8000 1831 – 3050 31 0.1200 3.0 M401017 300,200
* Btu/hr derate of 4% per 1000 ft. (305 m) of altitude.