The ProtectoCube product line is a filter unit equipped with filter cartridges applicable for nearly every task in the area of fume and dust filtration. The polluted air is extracted by means of the ventilator and guided towards the filtering section. The toxic particles are deposit on the surface of the filter cartridges. The cartridges are cleaned automatically by compressed air. The particles deposited on the cartridge are detached by the compressed air blast and reach a dust collecting tank. The cleaned air is recycled to the working space without any heat loss.