Hongfa FLT4825 Carbon Activated Pre-Filters, Compatible GermGuardian FLT4825 Air Purifiers for Filter B, AC4825/AC4300/AC4800/4900/AC4250PT Series FLT4825 Charcoal Filters Replacements Fit Model : FLT4825 Compatible True HEPA Filter B for GermGuardian AC4825, AC4850pt, AC4300, AC4800, AC4900 Series air purifiers.Dimensions: 15.6 x 4.6 inches. FLT4825 Activated carbon filter reduces common odors from pets, smoking and cooking .Carbon Activated filters extend the life of the hepa filter and remove common household odors Multiple levels of cleaning include FLC 4825 HEPA Pre-Filter/Activated carbon layer to help improve indoor air quality The Replace GermGuardian AC4825 pre filter Capture more dust and particles than ever before with these specially made filters. Made thicker and more absorbent than the original pre-filter. Shipping List : 6 Packs FLT4825 Pre Filters ( remove odor, smells and smoke. Ideal for pets, cooking, smokers & people suffering from asthma or allergies. ) and 1pcs Free cleaning brush (can clean your air purifier )