The HEPA-MAX® is a 10.75" mini-pleat capable of delivering 2000 cfm at 1.0" w.g. in a 24"x24" filter. At 100 FPM air velocity it's pressure drop is a low 0.16" w.g.(minimum efficiency is 99.97% and available in most sizes). The HEPA-MAX® is manufactured in efficiencies up to 99.99999+%. No other conventional box filter can equal the performance or long life of the HEPA-MAX®. The HEPA-MAX® advantage: 2000 CFM @ 1.08" w.g. * with a minimum efficiency of 99.97+% in a 24"x24" filter. 100 FPM @ 0.17" w.g. in a 24"x24" filter. Upgrade from hepa to ulpa with no additional operating costs and little or no equipment changes. Lowest energy cost per filter in new or existing cleanroom designs. DOP, PSL, scan and/or laser efficiency tested as required. * Factory tested at 2000 CFM on production filters - not extrapolated from 1000 CFM test flow.