P550274 Wire Mesh, Efficiency Beta 2: 150 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
P565062 Synthetic, Water Absorbent, Efficiency Beta 2: 10 micron