Custom designed 3-stage heat exchanger increases temperature of a 25,000+ SCFM airflow from 50°F to 330°F using 145 PSIG steam. System shown has three stages, with each stage nearly 7 feet tall and 8 feet wide, providing heated air to dry crumb rubber during processing. System design uses seven identical internal cores, each with two stacked steam circuits. The seven cores are split between three housing boxes to simplify handling, shipping and core replacement (if required). Using identical cores also reduces parts inventory. Company has more than 25,000 units in use worldwide and can optimize any of its 9 standard product models to control temperature and humidity, eliminating the need to design a custom heat exchanger for each application.