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air vents anthracite coal arrangement ash pit automatic heat B.t.u.'s per lb bituminous coal Boiler Connections boiler room burn cellar Chapter chimney clean condensation pump cool damper regulator draft equipment equivalent expansion tank expensive fire Flow and Return flues friction fuel gable Gate Valve gauge glass grate Gravity Return Steam gravity return system greenhouse grade greenhouse heating heat the greenhouse heating pipes heating plant height hot water heating hot water system install lineal feet lineal ft located main and return mains and colls multiply oil burner perature Perkheater pipe needed pitch down hill Pump Return Steam pump return systems radiation Return Coils return main Return Steam Heating rising circulation safety devices shown in Fig smoke pipe square feet Square Round Steam Heating System steam main steam pipe stoker sure System with Overhead Table temperature thermostatically controlled tion types of hot valve water heating system zero