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Actual cubic feet per minute (ACFM) is a unit of volumetric flow. It is commonly used by manufacturers of blowers and compressors. [1] This is the actual gas delivery with reference to inlet conditions, whereas cubic foot per minute (CFM) is an unqualified term and should only be used in general and never accepted as a specific definition without explanation.
It can be used to ventilate up to 1,250 square feet (116 m 2) of area and can move air at up to 800 cubic feet per minute (400 L/s). Because of the wide availability of 12 V brushless DC electric motors and the convenience of wiring such a low voltage, such fans usually operate on 12 volts .
R p = ventilation rate per person (cubic feet per minute (CFM) per person or cubic meters per minute per person) ACPH = Air changes per hour; D = Occupant density (square feet per occupant or square meters per occupant) h = Ceiling height (feet or meters) One cubic meter per minute = 16.67 liter/second
The air column from a 3-foot-diameter (0.91 m) fan, therefore, has more than six times as much friction interface per volume of air moved as does the air column from a 20-foot-diameter (6.1 m) fan. [8] When the down column of air from an HVLS fan reaches the floor, the air turns in the horizontal direction away from the column in all directions.
15 CFM per person: 7.5 L/s per person: Odor control, outdoor air as a fraction of total air ASA: 1946: 15 CFM per person: 7.5 L/s per person: Based on Yahlou and contemporaries ASHRAE: 1975: 15 CFM per person: 7.5 L/s per person: Same as above ASHRAE: 1981: 10 CFM per person: 5 L/s per person: For non-smoking areas, reduced. ASHRAE: 1989: 15 ...
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