The GRUF Series Firebox by Monessen is a versatile vent free option for any design application. Zero clearance capabilities makes it possible to bring construction materials, such as wood or sheet-rock, right up to the firebox for a clean, contemporary look. Vent free operation with no flue or hearth required and gas line knockouts available on either side make installation easy and economical. Radiant face design includes heat circulating air ducts that allow for installation of an optional blower to provide full environmental effect. Refractory firebrick and screen mesh curtains provide true fireplace appeal and the wide viewing area guarantees you enjoy a beautiful flame presentation.Clean and easy zero clearance design Enjoy radiant warmth and a wide viewing area Efficient and economical vent free application Heat circulating air ducts for optional blower installation Refractory firebrick and mesh curtains for true fireplace appealBlower: Optional Brick Liner: Refractory Firebrick CSA CGA AGA Approved: Yes Cubes: 13.08 Facing: Circulating Firebox with Radiant Clean Face Fuel Type: Firebox Only, No Logs Gas Knockout: Yes Junction Box: Yes Rough Framing: 37-1 4 x 35 x 15-1 2 Viewing Dimensions: 32 x 21-3 4 Weight: 104