Test Description:
Filter performance is often expressed in terms of percent efficiency, defined as the ratio of upstream particle concentration compared to the downstream concentration that has passed through a filter body (multiplied by 100).
The efficiency of a filter varies for different particle sizes and flow rates. For this reason, air filtration efficiencies have been classified by particle size on the horizontal axis of the shown graph.
Test Method: E-304 and/or E-217
Fluid: Air
Temperature: Ambient
Face Velocity: 50 ft/min (25.4 cm/sec)
Sample Size: Disk 3.54 in. OD (90 mm OD)
Geometry: Flat Sheet
Contaminant: KCl neutralized (E-304)
Dust or Latex spheres (E-217)
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Applications
Filtration
by Product
