This fine filter cartridge can be used with the R8578 Premium Wall Mounted Dust Collector to increase the level of filtration from 30 to 1 micron or as a replacement for the fine filter supplied on the R8581 Premium Fine Filter Wall Mounted Dust Collector. This pleated canister filter, traps particles as small as 5 micron, preventing fine dust from re-entering the workshop. You do not even have to open the cannister to unclog it, you simply turning a crank handle, which spins a flap, knocking the dust off the walls of the loaded canister filter. The filter generates an impressive air flow of 750 m3/h, which is measurement of average air flow rather than a peak air flow, that other manufactures may detail. The filter must be used in conjunction with the R8586 80 litre clear collection bags.©