HVAC As explained in problem 11 on page 434, the ACH of a house is a measure of its air-tightness. The formula for ACH is
where L is the air leakage in cubic feet per minute (cfm) and V is the volume of the house in cubic feet. If a house has a volume of 25,600 cu ft, what is the maximum amount of air leakage that would result in an ACH of no more than 1.25?

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