Clean Air Booths and Benches and Rooms Custom designed and fabricated downdraft bench with carbon and permanganate filters for VOC fumes. Custom paint spray and mix station with turntable and carbon filters. Large custom downdraft bench with booth awaits shipping to a customer for a tantalum dust application. Special dust and fume booth with full enclosure. Special dust and fume booth with full enclosure. Small downdraft bench with HEPA filter.