3M Filtrete Eureka HF-11 Ultra Allergen Vacuum Filter - 1 filter Fits vacuum models EUREKA* 4230 Series Uprights. 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.