Premium filtration with odor control. Traps dirt, dust, pollen and other allergens that create odor. Activated charcoal layer helps neutralize unpleasant odors. Ideal for households with pets. Universal Style fits both F-Style and Twist-Style Kirby Models. Works with G4, G5, Gsix, Ultimate G, Ultimate G Diamond, Sentria, Sentria II, and Avalir models.