When high heat output and cleaning burning technology is desired, the Constitution is the answer. This EPA Phase II Compliant woodburning fireplace provides exceptional heating capacity 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 20-year Buyer Protection Plan.