Frigidaire PureAir® Refrigerator Air Filter is a proprietary replacement part for Frigidaire® refrigerators. This innovative, easy to change air filter combines activated carbon to reduce acidic and basic odors, commonly found in foods stored in refrigerator or freezer. The PureAir® filter helps to reduce odors from foods such as onions, garlic, fish, stale milk and over-ripe fruits and vegetables. Recommended air filter replacement is every six months.