A technician takes the following readings while checking the operation of an electric furnace with 2 heat strips: 220 volts, 36 amps, 70°F return air temperature, and 120°F supply air temperature. What is the airflow through the furnace?

A) = = 540 CFM B) = = 158 CFM
C) = = 500 CFM D) (120 - 70 ) × 1.08 × 10 = 540 CFM


C

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