DESC: If you’re like most Kirby owners, you bought your system because of its ability to pull out dirt from deep within your carpets and furniture. But even more important, is that it keeps the dirt inside the filter. Kirby’s Allergen Reduction filters capture and hold 99.97% of particles down to .1 micron in size.l. Up to twice the capacity of standard paper bags. Minimizes bag odor. Fits all Kirby Generation Series models.