The Harman Accentra pellet insert is designed to go into a masonry fireplace and vent with 4 inch stainless steel pipe up to the top of the chimney. This is a 42,000 BTU stove heating up to 1500 sq ft. This is an auto light unit utilizing Harman’s patented room sensor technology which keeps the heat in the room within 2 degrees of set point along with an ash pan. This insert has been completely gone through to ensure its ready to go. This is in our Rutland showroom currently and is ready to be installed or picked up.