The Glasfloss Z-Line Carbon Pleated AC or Furnace Filter Merv 10 Offers Electrostatic Charged Thermally Bonded 100% Synthetic Fibers To Increase Initial Efficiency. The Z-Line Activated Carbon Pleated Filter Helps Reduce Unpleasant Odors Created By Cooking, Cigarette Smoke, Pets and Numerous Other Offensive Airborne Odors. The Gradient Density Media Is Supported By A Galvanized Expanded Metal That Maintains The Pleated Media Pack. The Media Pack Is Sealed With A Heavy Duty Beverage Board, Die Cut Frame and Has a High Dust Holding Capacity. The Z-Line Carbon Pleated Filter Is Used In a Wide Range of Residential, Commercial and Industrial Applications and Comes In a Wide Variety Of Standard and Special Sizes In 1, 2, and 4 Inch Depths.