AAF Flanders 20″ x 25″ x 1″ Nested Glass MERV 1 Air Filter,4 Filters.
4 x Nested Glass Air Filters. Type Nested Glass Air Filter. Low resistance to airflow for energy-efficient operation. Simple installation makes filter changes quick and hassle-free. ⭐ Key Features. Standard 20″ x 25″ x 1″ size fits most HVAC systems.