Rotary Air Filter: Rotary air filter system composed of: -Rotary pneumatic filter with automatic cleaning FRP type for the filtering of extract air, composed by a rotary drum of drilled steel with different diameters and lengths according to the plant. The filter is composed by JM4A suitable filtering fabric, by a series of suction openings required for the cleaning of the filtering mat, operated by a pneumatic piston complete of accessories for the differential pressure control and by pvc piping for the connection of the nozzle with the dust collector. - Dust Collector: Air inlet box with intermediate piece made of sheet steel. Fixing sleeves for tubular cloth filter and dust bags. Wall mounting support. Tubular cloth filter and dust bags, as well as control manometer. -Centrifugal Fan: for Dust Transport Centrifugal fan with single suction directly coupled, suitable to transport dust and basts, with open type blades and antispark system, electric motor and counter-flanges.