Febreeze AF-FB1824.4 High Allergen Microparticle and Odor Reduction Air Filter 18-Inch by 24-Inch by 1-Inch Air Filter, 4-Pack Elecrtostatic air filter provides high performance allergen protection and fresh scent option Traps airborne allergens and reduces odors Includes optional fresh scent device that releases a hint of fresh scent throughout home Odor reducing technology built into air filter media 18 x 24 x 1 Febreeze filter lasts up to 90 days