AAF Flanders EZ Flow II Air Filter is a high-quality and reliable solution for keeping your indoor air clean and fresh. This 18 in. W X 20 in. H X 1 in. D fiberglass filter has a MERV rating of 4, making it perfect for capturing dust, pollen, and other airborne particles. With a pack of 1, this filter is easy to install and will provide long-lasting protection for your HVAC system. Breathe easy with the AAF Flanders EZ Flow II Air Filter.