ventilate pocket filter are used fine glassfiber media,better air permeability ... Outer frame: aluminum alloys or G.I frame.2.Filter media: used fine glassfiber media, or chemical fiber. ... permeability, high dirt holding and betIer performance6.Application: pocket filters are used in the industries of medicament,hospital, ... 592X592X610 3200 1 0 592X592X380 2400 1 2 ventilate pocket filter