Horsepower (mechanical) to cubic feet de natural gas per hour conversion calculator shown above calculates how many cubic feet de natural gas per hour are in 'X' horsepower (mechanical) (where 'X' is the number of horsepower (mechanical) to convert to cubic feet de natural gas per hour). In order to convert a value from horsepower (mechanical) to cubic feet de natural gas per hour simply type the number of hp to be converted to cubic feet de natural gas per hour and then click on the 'convert' button.