The first key element of air conditioning and ventilation systems is the air intake. If in civil systems a simple air intake is sufficient, in shipboard systems or oil&gas and thermoelectric power plants placed in sandy areas, the air intake system requires protection accessories. The most common accessories are drop separators or sandtrap louvers. These can be equipped with heating cables to avoid the ice formation on the blades or with filters for a further air filtration. Europair has developed, tested and patented a washable metal filter with G3 efficiency, unique in the market, mainly used in air intake systems in thermoelectric plants.