3M Filtrete Kirby Generation Micro Allergen Vacuum Bag Fits vacuum models KIRBY* Generation* Series Models, including Generation 3*, G4*, G5*, Gsix*, Ultimate G*, Ultimate G* Diamond* Addition and Sentria* (Units built prior to 2009). Micro Allergen bags help trap 90% of airborne pollutants 1 micron or larger, including household dust, dust mite debris, grass and ragweed pollen. Vacuum Bags should be replaced every 30 to 60 days for optimium performance. All vacuum brand and model names are registered trademarks of vacuum manufacturers.