Flanders PrecisionAire Pre-Pleat 40 Furnace Filter 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. Type Pleated Electrostatic, Material Synthetic, Size 16 In. x 25 In. x 4 In., Actual Size 15-1/2 In. x 24-1/2 In. x 3-3/4 In., Rating MERV 8, Life of Product 3 mo, Pkg Qty 1