You can't.....BTU/Hr is a unit of heat input i.e. Energy. Cu. ft./hr is a measure of volume flow rate. >>>>>>>>>>>>>>> If you are talking about Natural Gas divide btu input or output by 1000 for cubic feet of fuel used, propane divide by 2500 btu for cubic feet of vapor used.
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Not sure what exactly it is you`re looking for but here goes. If you are talking about a particular fuel: Natural gas contains = 1000 btu per cubic foot. Propane contains = 2500 btu per cubic foot. If you are talking about air conditioning it takes appx 400 cfm of air flow per ton of air conditioning to support it`s proper operation, and a ton of air conditioning = 12,000 btu. I hope one of these answers your question.
To convert Cubic Feet to Btu's, multiply by 1,000 1 CF = 1,000 Btu's 6,912 CF X 1,000 = 6,912,000 Btu's
Would need to know what you have 480 cubic feet of, in order to give you an answer.