Download excel sheets for air ducts calculations, duct sizing and friction loss. Download Air Duct Excl Sheets For Calculating duct friction loss, for rectangular and round duct, and equivalent round duct diameter. Duct Friction Loss Excel Sheets for Calculating Duct Size and Tables for Air Velocities Fan Static Head Duct Friction Calculator xls: This calculation […] The post HVAC Duct Friction Loss Spreadsheet Calculator Free Download [xlsx] appeared first on EngLogs.