A. Your exhaust system is comprised of two main elements: a chimney and stove pipe. There are two types of chimneys: a Class A metal chimney or a masonry chimney. Class A chimneys are rated to withstand temperatures up to 2100F and are easy to install. The stove pipe cannot go through ceilings, closets, floors, or any other combustible partition. It is the chimney that goes through combustible partitions and that goes out to the exterior of the house, according to the chimney manufacturer’s specifications.