P550274 Wire Mesh, Efficiency Beta 2: 150 micron
P551551 Cellulose, Efficiency Beta 2: 7 micron, Efficiency Beta 1000: 23 micron
P551553 Cellulose, Efficiency Beta 2: 17 micron, Efficiency Beta 200: 32 micron
P560693 Synthetic, Efficiency Beta 1000: 11 micron
P560694 Synthetic, Efficiency Beta 1000 23: micron
P564967 Synthetic, Efficiency Beta 1000: 5 micron