A fan in a residential furnace is needed to move 1700 standard cfm (ft 3 /min) of

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A fan in a residential furnace is needed to move 1700 standard cfm (ft3/min) of warm air at a temperature of 120°F. The fan will be installed in a building at an elevation of 6000 ft above sea level. Approximate the required fan rating in standard cfm at this elevation and temperature.

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