This WEB Eco furnace and air conditioner filter is reusable, washable and adjustable.Fits standard filter sizes 36cm by 50cm up to 50cm by 60cm .It has two-stage filtration and MERV 7.It captures pollen, dust, and pet dander size particles.Save money by reusing this filter for years.It helps to reduce landfill waste as it can be reused over and over.Parts are made from recycled plastic and comes with a six year limited warranty.