This filter measures 13.25x13.25x0.5 (Actual Size). It has a MERV 11 rating. The supercharged pleated panel filtering media is ideally suited for capturing fine airborne allergens such as dust, smoke, dander, mold, pet dander, and dust mites. It attracts particulates similar to dust being attracted to a TV screen. Uniform pleat shape enhances dust holding capacity and maximizes air flow. Up to 30-times more efficient at capturing allergens than ordinary fiberglass filters. Heavy duty construction frame prevents airflow bypass. Lasts up to 3 months.