Timberwolf T20I Wood InsertTransform your masonry fireplace into an efficient, clean burning and cost effective heating source with Timberwolfs T20I Wood Burning Insert. A clean and contemporary insert with extremely long burn times ensure you can watch the fire for pleasure instead of babysitting the fire for reloading. An included blower kit quietly circulates heat throughout the space. T20I KEY FEATURES 1. 9 cu. ft. firebox heats up to 1,800 sq. ft. at 65,000 BTUs 6" flue