Vent Filter Pore Size: 0.1um, 0.2um, 0.45um, 0.65um Length: 10",20",30",40" End Cap: 226Flat/Fin, 222Flat ... /Fin,DOE Vent FilterFEATURE & BENEFITSA. The membrane of PTFE vent filter cartridges stack consists ... of PTFE vent membrane and imported deflector ...