"Where the fan power motor can be established from the fan nameplate or Building Logbook, O & M manual etc during the site survey the established power will be used to calculate the SFP. If the power rating of a fan is known in horsepower then it shall be converted using the approximation of 1 horsepower = 746 Watts. Where the power rating of the fan is not established then the SBEM defaults will have to be used."