The Pleasant Hearth Grandior Bay Fireplace Glass Door is featured in a high heat, powder-coated Antique Brass finish that enhances a traditional masonry fireplace hearth. This one-piece frame construction is designed as a surface mount and sits outside the fireplace opening against a flat surface. A Fireplace Glass Door assists in reducing heat loss or cool air loss up the chimney by as much as 90% which equals a year-round energy savings when the fireplace is not in use. Pleasant Hearth Fireplace Glass Doors all come with easy grip handles, hidden damper control knobs for air flow control, and heat-resistant thick insulation. Always keep mesh panels closed and glass doors open when fire is burning in fireplace. For masonry fireplaces only; not for prefabricated. Made in the USA.