P171536 Wire Mesh, Efficiency Beta 2:
90 micron
P171539 Cellulose, Efficiency Beta 2 10: micron, Efficiency Beta 200: 32 micron, Efficiency Beta 1000: 36 micron
P171540 Cellulose, Efficiency Beta 2: 27 micron
P171541 Wire Mesh, Efficiency Beta 2: 60 micron