This Standard covers the construction and performance* (see Clause 3, Definitions) of gas-fired appliances with inputs up to and including 400 000 Btu/h (117.23 kW)† to determine their suitability for use at high altitude. The appliances include furnaces, boilers, room heaters, unit heaters, water heaters,and such other appliances where field conditions indicate the necessity of testing for high altitude use (see Clause 3, Definitions). The test rate means the appliance’s input at a datum of 600 ft (152 m) or 29.38 in Hg (99.2 kPa) pressure.
