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1. Divide the power rating of the fan, measured in kilowatts, by 0.746, a constant conversion value. If the fan, for instance, consumes 5 kW. then 5 divided by 0.746 equals 6.7 horsepower
http://www.ehow.com/how_8165360_calculate-cfm-air....
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1. Measure the length and width of a room where you need to calculate the required airflow. Multiply these together to get the square footage of the room, i.e., if the room is 10
http://www.ehow.com/how_5677999_calculate-cfm-hvac...
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1. Measure the room's width and length. Also measure the height of the room from the ceiling to the floor. 2. Multiply the three measurements from step 1 to determine the cubic footage
http://www.ehow.com/how_12164062_calculate-cfm-roo...
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