germguardian FLT4825 True HEPA Replacement Filter for AC4800 Series, Filter B, 3 Filters Pre-filter and true hepa filter captures 99.97% of allergens Charcoal filter helps reduce household odors Long-lasting filter needs to be replaced every 6-8 months Dimension 15.8 x 4.8 x 1.3 inches This is a high quality aftermarket product not Germguardian Product. Quality meets or exceeds leading national brands