3M Filtrete 20 in. W x 30 in. H x 1 in. D Carbon Pleated Air Filter (Pack of 4)The Filtrete Odor Reduction air filter is the most effective 1" filter at removing odors in the home. Using unique 3M technology with activated carbon, odors are absorbed into the filter. Effective against the strongest of household odors such as those from cleaning chemicals, pets, cooking, tobacco smoke and mildew. {Based on comparison of organic vapor capacity vs. other national retail furnace filter brands.} * UPC: 051141940045 Manufacturer Part