Consulting: Clean Room/Contamination Control. FLAT PANEL DISPLAY (FPD): Exhaust Gas Systems. Process Chemicals: Piping Systems. Process Gases/Gas Handling Equipment: Waste Control Systems, Safety Systems, Piping Systems - FAB-TECH manufactures PSP® corrosive fume exhaust ducts. PSP® is a factory mutual approved duct for fume and smoke without the use of sprinklers. FAB-TECH also manufactures Teflon-coated dampers and fans for corrosive fume exhaust systems.