They are made of acid-resistant chrome-nickel steel sheets. In grade 1.4404 according to DIN 17441 with a thickness of 0.5mm to 0.8mm. Or galvanized steel with a thickness from 0.5mm to 0.8mm. They are mainly used for flue gas, ventilation ducts and they are resistant to. The corrosive effects of acidic condensate formed during the […]