A common type of gas turbine intake filter is the cone and cylinder combination. We have made orders of these type of filters in many different media types. Lately the efficiency levels of media has been increasing. We have supplied numerous orders of MERV 16 glass back synthetic media for high moisture environments. More recently the HEPA grade E12 media types are being used. We can also customize the filters even more for your application. If you have an issue that needs to be solved just ask!