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A fan rated at 20,000 CFM does not deliver 20,000 CFM in every building. That published number only applies at a stated static pressure, air density, fan speed, and test condition. Commercial Ventilation 101: learn how static pressure and temperature affect CFM before selecting exhaust, supply, roof-mounted, or wall-mounted equipment for a warehouse, manufacturing plant, grow facility, agricultural building, or equipment room. The practical issue is simple: if the real system creates more resist …