The exhaust ducts convey process exhaust air polluted by chemicals that can contain, for example, sulphuric, hydrochloric and nitric acids, sodium hydroxide or ammonia. HALAR is a material which can be powder coated and stems from the Teflon family. Compared to most other mediums it is durable, lasting and reliable. We can professionally design, engineer, manufacture and coat any standard shape, round or rectangular, for the air technology sector. Standard procedure for exterior surfaces is full-surface pickling.