Pre-Filter (11"x9"x1") for Compact 70 Dehumidifiers (4027168) Bundle 4 PSI is retained while

4 PSI is retained while the valves exhaust old air and replace it with fresh air

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Pre-Filter (11"x9"x1") for Compact 70 Dehumidifiers (4027168) Bundle 4 PSI is retained whileProduct Overview Replacement pre filter for the Santa Fe Compact 70 Dehumidifier. The pre filter is the first layer of defense in your dehumidifier. It catches large dust and dirt particles. It prevents them from entering the main machine and the deeper, inner filter. You can wash the 4027168 pre filter to keep your unit running well. It is best to wash it with water and mild soap. Let it dry completely before putting it back. Experts suggest washing