Flanders PrecisionAire Pre-Pleat 40 Furnace Filter 20 In. X 25 In. X 2 In. (Pack of 12)

100% synthetic recyclable high-loft, reinforced, nonwoven cotton/synthetic blend filter media that doesn't rely on an electrostatic charge to capture particles. V-pleat design allows for total media use and provides maximum air flow and dust holding capabilities. Heavy-duty 2-piece moisture-resistant frame with horizontal and diagonal support for filter strength and easy changeout. Filters pollen, pet dander, dust/lint, dust mites. Average ASHRAE efficiency is 25% to 30%. Average arrestance is 90% to 92%. MERV 8 level of performance. Lasts up to 90 days. Online purchases are in packages of 12.