Master Flow 12 in. x 4 in. to 6 in. Universal Register Box - Walmart.com
10 x 6 (Register) Ceiling Box with 6" duct supply. Sheet Metal Sides Duckboard Insulated Inside. - - Amazon.com
Box with 200 recipe cards and 24 registers, REZEPTBOX, baking, cooking, recipe box with index cards, special gift idea, sperlingb | Recipe cards, Special birthday gifts, Special gifts