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The volume of air that must be circulated through the room is measured in cubic feet per minute -- CFM -- and determining the correct volume is the key to a. Cubic Feet Per Minute (CFM) is a measurement of airflow volume, determined by how many cubic feet of air pass by a stationary point in one minute. To calculate Air Flow in Cubic Feet per Minute (CFM), determine the Flow Velocity in feet per minute, then multiply this figure by the Duct Cross Sectional Area.

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Go to the Air Flow (CFM) screen on the Kestrel. Hit the Center button to enter the dimensions of the vent: Shape – Circular; Diameter 18 (or 20 inches). The term "CFM" is an acronym that stands for "cubic feet per minute," a term used to describe a fan's efficiency in terms of airflow. Determining the CFM of. The airflow is then measured by multiplying the air velocity (in LFM) and the cross-sectional area of the duct. Therefore,. Airflow (in CFM) = Air Velocity (in.

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Divide the volume of your bathroom in feet by The result is the CFM, or cubic feet per minute rating required for your bathroom fan. The CFM represents the. CFM/CMM: airflow units of measure. •. Ft2, m2: units for area dimensions. • m/s, ft/min, km/h, MPH, knots: air velocity units of measure. You would now multiply this area measurement ( by your desired FACE VELOCITY, in this case fpm and that will give you the CFM requirements you.