The Dri-Eaz Replacement HAF Filter (F372) is a replacement HAF filter designed for the Dri-Eaz Revolution, Evolution, and DriTec 4000i dehumidifiers. They are designed to keep the interior components of your dehumidifier free of debris and dust while preventing restriction to airflow. Regular replacement of filters ensures maximum efficiency and prevents cross contamination through multiple uses. This listing is for a pack of 24 filters.