The Fillmore glass fireplace door is a decorative 9-pane prairie style cabinet door with a high heat powder coat finish which enhances a traditional masonry fireplace hearth. The one-piece frame construction is designed as a surface mount and sits outside the fireplace opening against a flat surface. Glass fireplace doors assist in reducing heat/cool loss up the chimney by as much as 90%. That equals a year round energy savings when the fireplace is not in use. The Fillmore glass fireplace doors come with easy grip handles, hidden damper control knobs for air flow control and heat resistant thick insulation. For masonry fireplace only not for prefabricated. Before you buy, measure the front opening width and height to choose the correct size