Using fleece filter bags drastically improves the lifespan of both standard and HEPA filters. If using a fleece filter bag, you must make sure that the automatic filter cleaning (AFC) is switched off to avoid damaging the fleece filter bag. It is intended for Bosch dust extractors. The Fleece Filter Bag is a replacement bag for dry vacuuming. Made of fleece, it easily collects and removes dust. It features a better durability, performance and safety compared to standard paper bags.