23 50 00 Central Heating Equipment

23 57 00 Heat Exchangers for HVAC

23 57 13 Steam-to-Steam Heat Exchangers 23 57 16 Steam-to-Water Heat Exchangers 23 57 19 Liquid-to-Liquid Heat Exchangers 23 57 19.13 Plate-Type, Liquid-to-Liquid Heat Exchangers 23 57 19.16 Shell-Type, Liquid-to-Liquid Heat Exchangers 23 57 33 Direct Geoexchange Heat Exchangers

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