Helps reduce odors and freshens the air inside your refrigerator. No tools needed for installation. Note: Frigidaire has redesigned the PAULTRA so only one side of the filter has the removable flap. PROP 65 WARNING: This product contains arsenic known to the State of California to cause cancer and birth defects or other reproductive harm. Experience the benefits of an odor free refrigerator with the PureAir Ultra air filtration system.