Abstract: A metal chimney construction for use with heating fixtures such as prefabricated fireplaces. The chimney is constructed from pipe sections joined together by an "inside-outside" coupling ring. The ring is formed from thin-gage sheet metal, shaped and seamed to form an integral cylindrical body. One end is dimensioned to receive the end of a first adjoining pipe section therein, the other end is dimensioned to receive the end of a second adjoining pipe section thereover. A modified coupling for coaxial, multiple-pipe installations is also disclosed.

Abstract: A freestanding fireplace comprising a firebox and a spaced, outer housing has a primary draft to ventilate the firebox and secondary drafts to cool the firebox. The primary draft flows into the flue from the firebox through a conduit or pipe which fits within and is spaced radially from the flue. Secondary drafts flow through passages defined by the space between the firebox and the outer shelf and enter the flue around the outside of the primary draft pipe. The flow of the primary air draft creates a reduced pressure effect which draws air through the secondary draft passages, thereby cooling the firebox and the flue. Smoke spillage prevention means are also provided.