Tesa Fine Dust Filter for Laser Printer Small (50378-00000-01) tesa® Clean Air is easily attached to the printer's ventilation shaft using a high-quality and self-adhesive Velcro system. This does not interfere with the printer's ventilation. The fine dust filter of tesa® Clean Air consists of a three-layer special fleece that filters even the finest dust particles. The innovative high-performance fleece... is extremely absorbent and can be disposed of with household waste.