Dürr Universal‘s ILFV Series Of In-Line Air Filters Are Designed To Provide An Economical Alternative To The ILF Series. Ten Standard Connection Sizes Are Available Ranging From 2″ To 14″ With Flow Ratings From 120 to 5,900 CFM. There Are Three Choices Of Filter Elements Available: Pleated Cellulose, Pleated Felt, Or Wire Mesh.