industrial process heat application systems, namely, crucible preheaters and dryers, ladle preheaters and dryers, tundish preheaters and dryers, trough preheaters and dryers, furnace preheaters and dryers, SOW dryers, AOD preheaters and dryers, bell dryers, snorkel, ovens, car bottom furnaces, beam, billet, blank preheaters, directly and indirectly fired air heaters, fume oxidizers, heat exchangers casting preheaters