||Air Filter Particle-Size Efficiency Testing for Diameters Greater Than 1 mu m.
Ensor, D. S. ;
Hanley, J. T. ;
Sparks, L. E. ;
||Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab. ;Research Triangle Inst., Research Triangle Park, NC.
Air pollution control equipment ;
Air filters ;
Particle size ;
Indoor air pollution ;
Performance evaluation ;
Air pollution sampling ;
Air cleaning ;
Air quality ;
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The characterization of indoor air cleaner efficiency over a wide range of particle diameters (from 0.01 to 30 micrometers) is desired to understand performance when these devices are placed in service. The paper discusses tests of air filter particle-size efficiency for diameters greater than 1 micrometer. Evaluation of air cleaner efficiencies in this size range can be quite demanding, depending on the required accuracy. Such particles have sufficient mass to require consideration of sedimentation and inertial losses. The challenge aerosol is usually generated by dispersion of a dry powder or by liquid spray. In-duct particle measurements are preferred to extractive instruments because of particle loss in sampling tubes. Large particles are also sensitive to non-isokinetic sampling effects.