Precision Filters 1) Grades: HF9, HF7, HF5, HF3, HF1 ... fiber media for fine coalescenceOuter coated, closed cell foam sleeve 4, Ultra high efficiency oil removal filter ... cores Two stage filtrationFirst stage—coated, closed cell foam sleeve acts as pre-filter and flow disperser ... media prevent particle migration Outer coated, closed cell foam sleeve prevents fiber migrationDesigned for 1000 hour life ...