Features: he pre-filter is high density, small mesh, polygonal structure and honeycomb-shape, which can increase the compressive capacity. Pretreat the air, effectively-intercept 10 PM particulate pollutants such as dust, hair and fine debris. Effectively prolong the service life of HEPA. Made from durable and reliable cotton material, these-filters can effectively filter out micron-grade dust and prevent secondary pollution. They also feature a full-scale filter-design that improves filtration efficiency, and can be easily dismantled and cleaned independently. Ideal-for anyone who relies on their air purifier to keep the air in their home or office clean and healthy. Perfect for use in any indoor space, from bedrooms and living rooms to offices and workspaces. With these replacement-filters, you can enjoy-fresh, clean air-without worrying about harmful pollutants or-allergens. Specifications: Material:Plastic Size:Approx.17.7x16.6cm/6.96x6.53inch Applicable area: 101-150 square meters Functions: air purification, cleaning and filtration. For Medify MA-14 MA-14W MA-14B Package Includes: 2pcs Air Dust Filter note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.