Still looking for the proper filter for your air purifier? This Hepa filter can properly combine with air purifier to release fresh air for you and your family. It removes smoke, pet dander and cooking odors from the air in your home. And it can combine with air purifier to be used in your bedroom, living room, office and kitchen. This sturdy filter helps you create a clean and comfortable living condition. We suggest replacing the old and dirty filter every 6 months. But you can replace it earlier according to actual operating environment. And the filter net is designed with a strap for easy pulling and replacing. Note:This product does not meet California air cleaner regulation requirements, and can not be shipped to California.