Monessen Gruf36c-r 36-inch Radiant Face Circulating Vent-free Firebox With Refractory Firebrick 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 Appeal