Active Air Carbon Filter, 6" x 24", 500 CFMDescription Active Air Carbon Filters: These filters are packed with virgin activated Australian granular carbon. This type of carbon absorbs VOC's (volatile organic compounds), trapping every odor molecule that comes into contact with the micro porous carbon surface. These filters are lightweight and extremely effective at eradicating even the most potent odors. Each filter is machine packed and feature a pre filter. Attached Flange: This design