It has a 12.2 inch/312mm very large diameter, and it has 5 inside cores to support and separate. It is single open-ended with an inside to outside flow pattern.It has a very big filter area of 36 m2. The large diameter and very big filter area insures to reduce the number of filter cartridges and the dimension of housing required .The long service life and high flow rate result in low investment and less manpower in many applications.