"This Pleasant Hearth Alpine 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 5in. door handles. Fits masonry fireplace openings 36in. to 43in. wide and 25 1/2in. to 32 1/2in. high. For masonry fireplaces only. Not for use on pre-fabricated fireplaces. U.S.A. Dimensions W x D x H in. 43 1/2 x 1 7/8 x 33, Style Alpine, Finish Type Black, Fits Opening W x H in. 36-43 x 25 1/2-32 1/2. Reduces heat loss up your chimney by 90 when the fireplace is not in use Cabinet-style doors with easy-catch magnets fully open to provide a full view of your fireplace Sturdy metal mesh panels 3/16in. clear tempered safety glass 1in. thick welded construction Simple do-it-yourself installation"