by Guest » Thu Mar 17, 2005 3:13 am
I'm not sure what you mean by 'cfm.' A therm is an English unit of heat energy, 100,000 BTU. Natural gas is commonly sold in therms. Since natural gas usually has an energy content of about 1000 BTU cu. ft, one therm is about 100 cu. ft, often abbreviated ccf, another common unit for the sale of natural gas.