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 youre not enjoying fire, simply close the clear tempered safety glass to minimize heat and cool air loss. This handsome accessory features 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 in. 37 1/2 7/8 30, Fits Opening in. 30 to 37 22 1/2 to 29 1/2, Style Ascot, Finish Type Black