Cement dust must be dealt with as it is delivered to a concrete pre-mix batching plant. For this application the AAF FabriPulse L makes an ideal silo top vent filter. Its special “quick change” cassette of mini filter tubes combines the speedy service time of a cartridge filter with the robust performance of a bag filter thanks to its use of its tubular configured filtration socks which are widely acknowledged to offer superior clean down performance and extended filter media life.