snippet: Constructed of a 24 gauge galvanized steel double panel door and frame with mill finish for long lasting durability. 1/8" thick x 1/2"W closed cell neoprene gasketing between insulated door and frame assures tight seal without obstruction in air system. Frame includes 5/8" notched knock over tabs. Door panel filled with 2" fiberglass insulation compressed into 1" and includes aluminum continuous piano hinge. 6" W x 6" H outside flange dimensions. 4-3/4" W x 5/8" D x 4-3/4" H return flange dimensions. Color finish is <b>Silver</b>. Number of latches is <b>1</b>. <BR><BR> (Page 1)