Compatible with Honeywell HFT600 series and HEV-600 series: Honeywel HFT600 HEV615 HEV615B HEV615W HEV620 HEV620B HEV620W HEV-615 Comfortable use: The blue pre-filter layer can completely filter and capture large particles, helping to maximize the service life of the filter. High-quality filters can capture minerals and pollutants, thereby improving the air quality of your home. Let your family live in a fresh indoor environment and improve breathing quality High-quality materials: The professional environmental protection imported blue filter paper has a diamond-shaped grid structure, which can ensure the maximum transmission of water and absorption of products. The newly upgraded blue grid appearance enhances product performance and further ensures the cleanliness of the product Easy to install and replace-For best performance, it is recommended to replace the filter every 1-2 months. Replace the filter regularly to keep the air moist and warm, which helps to reduce nasal congestion, improve breathing comfort, dry skin and sleep Friendly service: each blue humidifier filter is individually packaged with good quality. If you have any questions about this product, please feel free to contact us. We are committed to providing the best quality products and promise to provide 100% quality customer service Keep remind: Please invade the water for a few minutes before use,they will fit just fine. 1.The humidifier needs to periodically clean the scale in the water tank, not clean the humidifier for a long time will produce mold. 2.Be careful not to put the machine into the water during cleaning; the temperature of the cleaning water should not exceed 50 °C. 3.Do not scrape the scale with hard objects, do not use detergent, kerosene, alcohol, etc. to clean the fuselage and parts, so as not to damage the parts. 4.When the humidifier is not used for a long time, the water remaining in the water tank and the water tank should be drained, and the parts should be cleaned, dried, and dried before being placed in the original packaging.