P165876 Synthetic, Efficiency Beta 1000: 11 micron
P165878 Synthetic, Efficiency Beta 1000: 23 micron
P165880 Synthetic, Efficiency Beta 1000: 50 micron
P167796 Synthetic, Efficiency Beta 1000: 4 micron
P550250 Cellulose, Efficiency Beta 2: 5 micron, Efficiency Beta 1000: 24 micron
P550251 Cellulose, Efficiency Beta 2: 7 micron, Efficiency Beta 1000: 23 micron
P550252 Cellulose, Efficiency Beta 2: 17 micron
P550276 Wire Mesh, Efficiency Beta 2: 150 micron
P561183 Synthetic, Water Absorbent, Efficiency Beta 2: 10 micron