DAMPER KITS For 120 volt & 240 volt Cabinet Ventilators Snap inside bushing into hole on inside of damper frame. Run rod through outside hole in damper frame, flap, and into inside bushing in damper frame. Snap outside bushing over damper rod. Repeat steps for other side. Check to make sure that damper opens freely. SERVICE PARTS Key | 120 Vito | 240 Volt No. | Gab. Vent | Cab.