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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