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Show In Heating Secure Cold Air From Several Pipes The Priuf'l''e f warm-air heating Is that of convection and a romhltm-tion romhltm-tion of methods Involved In nil hearing hear-ing prorogues. Air Is drawn In nnd In heated t , v coming Into eon'act with tiot metal surfaces. In Ihe hevi apparatus ap-paratus tic cold air Is taken In. not through one pipe nnd leaied en tnass-. but passes through i, number .f pire-s snrr,,i;i,d;ng the heat chamber cham-ber of the furnace, in whlcn it Is thoroughly thor-oughly healed, resulting In mnall streams of nir which are passed up 'hroi:gh separate heat duels it, rlip various rooa.s. where the heat erner e. uarin and rt.oister.ed froiv Ihe reg I i-ler in the vail or floor. |