Breathable-portable reusable net that attaches to your 45" round size fan and traps airbourne pollutants down to 5 microns- carcinogens that are naked to the human eye 45” Industrial filter (fits 45″ outer fan cage)
This filter can handle a CFM of above 20,000. This filter is the one I have seen filter at a impressive 18,000 cubic feet per minute rate. That's a high exchange rate. I've seen dust pulled in to the filter, from 25 feet away!