A. Fit Model: Can be used as a replacement for HFT600T, HFT600PDQ, HEV615, HEV615B, HEV615W, HEV620, HEV620B, HEV620W, HEV - 615, HEV - 615B, HEV - 615W, HEV - 620, HEV - 620B, HEV - 620W. B. Comfortable Life: A blue pre - filter layer protects the filter and captures particles, which is helpful for extending the filter's life. The filter captures minerals and pollutants to improve the air quality in your home. It allows your family to live in a better indoor environment and enhances breathing comfort. C. Excellent Performance: The HFT600T filter captures minerals and pollutants from the water and helps prevent white dust, thus improving your breathing comfort. It is easy to install and can be accurately mounted on your humidifier machine. D. Premium Filters: Made of environmentally friendly professional imported HEPA filter paper, it helps you make good use of your humidifier. The filter can stop white dust from hard water, keep the air moist and make the air feel warm. E. Value Pack: There are 6 filters for HEV620 humidifiers. They are cost - effective, so you can simply remove and replace dirty filters. It is suggested that you replace the filter about every 2 - 3 months to maintain good filtering performance. Regularly replacing the filter helps keep the air clean. F. Colour: white + blue G. Material: HEPA H. Size: 19.5x16.5x3.3cm I. Package Contents: 6 * filter J. Only the above package content is included, other products are not. K. Note: Light and different displays may cause the color of the item in the picture to be a bit different from the real thing. The measurement error is allowed to be +/- 1 - 3cm.