The external fogging installed on the air intake inlet, is also made out of the same material and equipment and is installed as well on the internal fogging and uses a pre-filter especially suitable for this kind of system, in any environmental conditions (including offshore, marine) and any climate. The system efficiently removes airborne particulate matter but also snow, mist and fog, acting as a filter and coalesces into one. The rigid pre-filters are especially designed for the elimination and drainage of free water and air borne salt crystals. The subsequent final filters are protected not only from coarse dust but also when running in wet conditions, thus significantly prolonging their life and increasing their operational safety.