Divide the energy transfer rate in Btu by 100,000 to convert Btu per hour to CFM per minute. Multiply the result by 96.7 to get the answer. To calculate the gas transfer rate in cubic feet per minute, multiply the result by 60.
Because there are 100,000 Btu in a therm, the Btu must be divided by 100,000. The volume of a therm of gas is 96.7 cubic feet. Because it is often easier to employ in mathematical formulae, this amount is sometimes estimated to be 100 cubic feet rather than the more precise 96.7 cubic feet, but the resulting value would be more of an estimate than an actual result. Because there are 60 minutes in an hour, the outcome of that equation is divided by 60. Because the energy of a gas is equal to its volume, it is possible to convert between Btu and CFM.
The most common unit of measurement for natural gas is the therm. When the number of therms exceeds 100,000, Btu is used. The Btu is equal to 105.5 megajoules and 29.3 kilowatt-hours of energy, in addition to 100,000 therms.