Phat Filter, 4" x 12", 200 CFMPhat Filter is one of the most famous carbon filtration systems worldwide. It uses top quality Mongolian virgin carbon that dates back to 250 million years. Virgin carbon absorbs the nasty smell and particulates from the grow area, the conical base provides greater airflow, and tightly packed carbon enhances porosity. More Air Holes Per Square Inch: The outer surface of the filter has more air holes per square inch compared to other filters on the