Fume Extraction Plant Gunatit Builders Supplies a Range of Different Plants Designed for HCL, H2SO4 HF , HNO3 and Mixed Acids. High Separation Efficiencies of 1 Micron Particulate and Gaseous Emission are Achievable. Customized Process Equipment for Metal Finishing Industries. Trun - key Execution of System Extraction of Corrosive Fumes and Gases from pickling tanks and zinc cattle.