The filter can be easily attached to the printer extraction fan vent using double sided tape. Fine dust particles are physically bound inside by the electro-statically charged, patented, triple layered filter. Certified by TUV Nord (German Technical Control Board) as providing effective protection against particulates & toner dust & harmless to effective printer operations. Suitable for laser printers, fax machines, photocopiers & multi-function machines. To choose the right filter size for your laser printer, simply locate the fan extraction vent, measure the diameter & choose the right filter size that will cover the vent (Small
Size: 100 x 80mm, medium
Size: 140 x 70mm, large
Size: 140 x 100mm) (Not suitable for HP models). Filter has to be replaced after 70, 000 printouts or every 12 months.