The product is a lot of 4 Filtrete 2500 14x20x1 premium allergen and ultrafine air filters designed for furnaces. Each filter is designed to last 3 months and features a MERV rating of 14, making it efficient in capturing airborne particles. The filters are white in color, come in a pack of 4, and use electrostatic filtration technology for optimal performance. Made with a proprietary filter media and a paper filter frame, these filters are a reliable choice for improving indoor air quality.
eBay