Allstar ALL13009 4" Diameter 8" Length 240 CFM Rating Heavy Duty Model In-line Duct Blower Blower is a heavy duty model with a 4 inch diameter opening and has an 8 inch overall length It has a 40 cfm rating at 13.6 volts with a 3.5 amp draw Great for use on braking systems for extra cooling It has a 90 day limited warranty Sold each