Acid fume extraction systems are installed to take the toxic/acidic fumes away from the pickling tanks and prevent them from spreading inside the shop floor and cause pollution. Corrotech critically designs the suction duct at a predetermined minimum velocity rate that have to be applied to make sure effectiveness. The suction slot ducts are manufactured using chemical corrosion resistant Polypropylene or FRP using well equipped thermoplastic workshops fitted with the proper welding equipment.