This Altus air flow product is intended for floor application. It is constructed of 24-gauge steel and built with welded construction and durability to handle the demands of everyday life. Altus air flow products are designed to help you achieve added energy efficiency.Heavy-gauge steel, 0.6mm thick faceplate, 0.5mm thick damper. Multi-angle fin setting. Rolled fin for strength and safety. Heavy-gauge stamped face and welded construction. Foot-operated dial control. Powder-coating finish. (10") Outside dimensions: 11-1/2" x 3-3/4", Inside dimensions: 9-5/8" x 2". (12") Outside dimensions: 13-1/2" x 3-3/4". Inside dimensions: 11-5/8" x 2".