It is used with Duo-Therm models 54608, 54615, 55712, 55715, 55812, 55815, 57008, 57012, 57015, 58925 & 59406, Briskair 10-1/2 inch high, 55908, 12-1/2 inch high, 55912, 12-1/2 inch high & 55915 models. It features parachute style draw cord mounting, non-tearable seams & weatherproof. It measures 27 inch width x 13 inch depth x 35 inch length.