When high heat output and clean burning technology is desired, the Constitution is the answer. This EPA Phase II Compliant woodburning fireplace can be operated in locales with strict air quality regulations or "burn bans" for conventional woodburning fireplaces. It provides exceptional heating in a non-catalytic, environmentally-friendly unit. Provides up to 51,400 btu's per hour. This fully-insulated firebox features two standard 160 CFM fans with blower control, air wash, up to 22" east-to-west log loading, standard firebrick linkng, outside air kit, the ability to control the combustion rate with a single lever, and an exceptionally large viewing area. Uses economical SL300 air-cooled snap-lock chimney system for easy, inexpensive installation. Heatilator Warranty.