This Simply brand pleated furnace and air conditioner filter features nominal dimensions of 18 in. x 24 in. x 1 in. and carries a high-efficiency MERV 13 rating (equivalent to an FPR 10 performance level). Engineered with electrostatically charged synthetic fibers and supported by a durable frame, it maximizes airflow surface area while effectively trapping microscopic airborne contaminants such as allergens, fine dust, pet dander, pollen, smoke, bacteria, and viral particles. It is ideal for residential HVAC systems, furnaces, and heat pumps to help maintain fresh, clean indoor air. This item is an authentic listing matching model number S-13-06-18241 and is supplied in a used fair condition, suitable for mixed lot inventory processing or secondary resale evaluations