1'x1' Black Plastic Antique Diffuser

1'x1' Black Plastic Antique Air Diffusers A unique plastic ceiling diffuser which incorporates an integral ceiling box. Intended for residential and light commercial applications, these products are actually 11-1/4" x 11-1/4” square. They provide maximum convenience and timesaving as they are designed for easy installation by one man only working from below the ceiling. Included is a built in Air Damper to restrict air flow when desired. Zip Tie Included. Used for a 4",6" or 8" duct.