Show in heating secure cold air from several pipes the taic principle of warm wann air heating is that rif connection and a bombina von of methods involved in all heating processes air Is drawn in and Is heated by coining in contact with liot hot metal surfaces in the best apparatus the cold ale air Is taken in not through one pipe and heated en mase but bill passes through a number of pipes surrounding the client chamber of the furnace in which it Is thoroughly resulting sul ting in small streams of air which til tile lire e passed up through separate heat ducts to the V various rooms where the heat eni emerges erges warm and moistened from the register in tile wall or floor door |