Active Air Carbon Filter, 4" x 14", 215 CFMDescription Active Air Carbon Filters: These are filled with virgin activated Australian granular carbon. This particular type of carbon absorbs Volatile Organic Compounds (VOCs), effectively capturing every odor molecule that passes through the filter onto the micro porous carbon surface. These filters are not only lightweight, but incredibly effective in eradicating the most potent and unpleasant odors. They come machine packed and include a pre