P165877 Synthetic, Efficiency Beta 1000: 23 micron
P165879 Synthetic, Efficiency Beta 2: 14 micron, Efficiency Beta 1000: 50 micron
P167162 Synthetic, Efficiency Beta 1000: 6 micron
P550275 Wire Mesh, Efficiency Beta 2: 150 micron
P550386 Cellulose, Efficiency Beta 2: 5 micron, Efficiency Beta 1000: 24 micron
P550387 Cellulose, Efficiency Beta 2: 17 micron, Efficiency Beta 1000: 40 micron
P550388 Cellulose, Efficiency Beta 2: 7 micron, Efficiency Beta 1000: 23 micron