Two metal centrifugal blower wheels Suitable for kitchen applications Painted white enamel steel grille Quiet automatic backdraft dampers Can be ducted horizontally or vertically. In-line ducting available with separate adapter Order Aluminum Filter LAF2 Use Broan Electronic Variable Speed Control to adjust blower speed and sound level (available separately)Amperage: 1.4 CFM: 406 Collection: LoSone Duct Size: 4-1 2 x 18-1 2 Finish: White Function: Utility Fan Grille Length: 23-1 4 Grille Width: 14 Heater Included: No Housing Depth: 11-3 4 Housing Length: 21-1 2 Housing Width: 12-1 4 Humidity Sensing: No Installation Type: Ceiling Light Included: No Motion Sensing: No Sones: 3.3 UL Listed: Yes Voltage: 120 Wattage: 146 Weight: 36.20