The Organic Air Charcoal Fiber Filter will enable single pass filtration of strong odors at very high CFMs. They consist of three layers of highly active charcoal fiber with millions and millions of active micro pores that attract and capture odors. The filter is easily washed to keep the micro pores clean and ready to absorb more odors. They can be used with fans from 0-6000 C.F.M.. The highest rated filters with the largest surface area on the market, and at less than ½ the size of old traditional filters!