This Pleasant Hearth Ascot Fireplace Glass Door reduces heat loss up the chimney by 90% when the fireplace is not in use, plus add style and function. When you're not enjoying a fire, simply close the clear tempered safety glass to minimize heat and cool air loss. This handsome accessory features a high-temperature classic black powder-coated finish and easy-grip 4in. door handles. Fits masonry fireplace openings 30in. to 37in. wide and 22 1/2in. to 29 1/2in. high. For masonry fireplaces only. Not for use on pre-fabricated fireplaces. U.S.A. Dimensions W x D x H (in.): 37 1/2 x 1 7/8 x 30, Fits Opening W x H (in.): 30 to 37 x 22 1/2 to 29 1/2, Style: Ascot, Finish Type: Black