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TABLE 14
SUPPLEMENTAL ORIFICE SIZE CHART
HIGH ALTITUDE
NATURAL GAS AT HIGH ALTITUDES (cont.)
High Altitude
Notes:
1. All R92, R95 single stage and R96 two stage units are factory equipped with orifices sized for 1100 sea level heating value gas.
2. Installer must be aware of the local heating value (sea level standard) to use the chart below.
3. This chart is based on the National Fuel Gas Code (NFGC) Annex E, 2015 Edition, based on natural gas with a specific gravity of 0.60
4. The recommended orifices below allow the furnace to operate within 10% of design rate. However, NFGC calculations are the best method.
5. Furnace operation is optimized when operating at design rate. Installer is responsible to verify rate.
6. This table applies to 90+ models only with 14,000 BTU/Burner. DO
NOT
USE THIS CHART FOR ANY 80+ FURNACE MODEL.
*Table is derived from Annex E, 2015 Edition, of the
National Fuel Gas Code.
To determine the correct orifice for your installation consult the
National Fuel Gas Code
tables E1.1(a) and E1.1(d), 2015 Edition.
**Be sure to use sea level heating value. When requesting the heating value from a local utility, it must be converted to sea level equivalent in order to
use this table.
Note:
Above 5,000 ft., the last 2 elbows on an alternate horizontal termination which are on the exterior of the building will be counted in the maximum
vent length and maximum number of elbows permitted.
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