American Aldes Motorized Dampers are available in sizes 4", 5", 6", 8", 10", 12" and 14". Normally closed or normally open. 24 VAC or 120 VAC models available. End switch rated for a 10 Amp load. The end switch permits sequencing the operation of a remote fan after damper is opened, enabling use of remote fans to selectively ventilate kitchens, laundry rooms, or individual bathrooms.