True Blue 18x25x1" MERV 2 Fiberglass Air Filter effectively traps pollen, dust, and lint, reducing dust and dirt buildup in air ducts, air conditioners, and furnaces. Constructed with heavy chipboard in a one-piece design, this filter features continuous filament spun glass media that adheres directly to the frame, eliminating the need for a retainer. A resinous bonding agent enhances rigidity and resistance to media compression. With a low initial pressure drop, it helps protect HVAC equipment and reduces energy costs. Lasts up to 30 days