Broan L400 High Capacity Commercial Grade Ventilation Fan 434 CFM 2.3 Sons, 120V, 1.4 Amps 4-1/2 18-1/2-Inch duct connector 434 CFM 2.3 Sons, 120V, 1.4 amps 4-1/2" 18-1/2" duct connector Two impact resistant centrifugal blower wheels and quiet automatic backdraft dampers Painted white enamel steel grille Can be ducted horizontally or vertically