The item facilitates the exhaust of combustion gases and intake of fresh air for heating appliances through a single penetration in a building’s structure. It comprises two pipes arranged concentrically, one carrying exhaust outwards and the other drawing air inwards. A typical application involves high-efficiency furnaces or boilers where space is limited or aesthetic considerations are paramount.
Such a system offers space-saving advantages compared to installing separate intake and exhaust pipes. It can also improve the efficiency of heating appliances by preheating the incoming air, thus reducing energy consumption. The design simplifies installation, potentially lowering labor costs. Historically, these systems have become increasingly popular as building codes emphasize energy efficiency and airtight construction.
