DC

HEAT RECOVERY EQUIPMENT-NAMELY, FIRETUBE WASTE HEAT BOILERS; WATERTUBE WASTE HEAT BOILERS; COMBINATION FIRETUBE AND WATERTUBE WASTE HEAT BOILERS; FIRED HEATERS; HEAT RECOVERY MUFFLERS; MUFFLE FURNACES; AIR HEATERS; GAS-TO-GAS RECUPERATORS; FEED WATER HEATER ECONOMIZERS; AND STEAM SUPERHEATERS