3M Filtrete Bissell 15 & 17 Ultra Allergen Vacuum Filter - 1 filter Fits vacuum models BISSELL* Healthy Home Vacuum* (5770, 5990, 6100, 6405, 6406 Series) and the Heavy Duty Multi Cyclonic* Vacuum (50C9, 50C91 Series). Ultra Allergen filters help trap 99% of airborne pollutants 1 micron or larger including household dust, dust mite debris, grass and ragweed. Vacuum Filters should be replaced every 30 to 60 days for optimium performance. All vacuum brand and model names are registered trademarks of vacuum manufacturers.