A. Compatible Models: Suitable for Essick Air 1040 / 1040 humidifiers. B. Comfortable Life: The pre - filter layer can protect the filter and capture particles, which may help to extend the filter's service life. The filter can capture minerals and pollutants, improve the home's air quality, allow family members to live in a relatively good indoor environment, and enhance breathing comfort. C. Performance: The filter can capture minerals and pollutants from water, which may help to prevent the occurrence of the white powder phenomenon and enhance breathing comfort. It is easy to install and can be accurately installed on the humidifier. D. Filter Material: Made of environmentally friendly, professional imported filter paper to utilize the effectiveness of the humidifier. The filter can block the white powder in hard water, keep the air moist, and make the air feel warm. E. Cost - effectiveness and Replacement: The humidifier filter for Essick Air 1040 is affordable and can easily replace the dirty filter. It is recommended to replace the filter every 2 - 3 months to maintain a good filtering performance. Regularly replacing the filter can help keep the air clean. F. Material: Plastic G. Color: Black and white interphase H. Package Contents: 4 filters I. Inclusions: Only the above package contents are included, and no other products are included. J. Notes: Due to light reflection and different monitors, the color of the item in the picture may vary slightly from the actual one. A measurement error of +/- 1 - 3 cm is allowed.