? ABOUT PRODUCT: This package includes carbon activated pre-filter pads of 4.8? x 15.75? each that are compatible with FLT4825 HEPA Filter, AC4800 Series, and Filter B Models. Cut-to-Fit Carbon Pad with microscopic mesh to catch dirt, common household pollutants, and other Odors, leaving only fresh air. The universal activated carbon pad pre-filter can be trimmed to fit any size filter. ? DURABLE: Our premium quality activated carbon pad is safe, with a mesh structure and stretch fabric material that is elastic, strong, and dependable. They can be used for an extended period of time without affecting regular ventilation, maintaining air circulation, and keeping your home clean. ? HIGH QUALITY: Each activated carbon pad is designed particularly for air vent filters in the home. Each air Pad filter is composed of a high polyester electrostatic material that is polyester. They're designed to be used as register and air duct filters, but they may also be utilized for various other DIY projects. Reduce the number of hazardous air particles by making your entire house smell better. ? MULTIFUNCTION: The universal carbon pad filter sheets can be applied to most air purifiers, air conditioners, humidifiers, range hood filters, vents, furnace filters, and other appliances, making your home more comfortable and offering you and your family members a healthier life. ? CONVENIENT TO USE: The universal carbon air filter sheets make it simple to change your old air purifiers, simply measure and cut them to fit your specific requirements before installing them in your air purifier, effectively avoiding the problem of size mismatched.