Many ventilation systems for the petroleum industry also require explosion protection. Explosive atmospheres arise mainly in the upstream sector (exploration and production) in the exploration and production of oil and gas, and downstream in the refining, cleaning and processing of oil and gas. For offshore energy plants, on ships or for plants near the coast, in addition to explosion protection, corrosion protection is also an important consideration: Fans and drives must be designed so that they cannot be damaged by moisture, harsh weather conditions and salty air. And even in the intermediate midstream sector, such as the transport and storage of oil and gas, there may be special requirements for ventilation technology.