The high quality Fasco Blower Wheel (1-6141 ) attaches to the drive motor shaft. The Blower Wheel blows air through the drum and out through the exhaust vent and has a 4 inch diameter and has about a 1.5 inch depth. Please be aware that it is recommended to use saftey equipment and to disconnect the appliance from all utilities prior to any service or repair. Please refer to your owners manual to confirm part numbers and for instructions as some repairs require a trained service professional to complete.