CECO Environmental wants to clear the air. Through its subsidiaries, CECO Environmental makes industrial ventilation and pollution control systems, including air filters to remove airborne solid and liquid pollutants. The company serves customers in the automotive, chemical, electronics, pharmaceutical, and textile industries, among others. Customers have included General Motors, Honda, and Procter & Gamble. CECO Environmental also provides custom metal fabrication services, making components for its own ventilation systems. Chairman Phillip DeZwirek and his family control CECO Environmental.