3M Filtrete Black & Decker VF20 & WVF30 Allergen Vacuum Filter - 1 filter Fits vacuum models BLACK & DECKER* 4.8 volt and Higher V Series DustBusters* and CMV9630 Models. Allergen filters help trap household dust. 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.