noting or using an air filter composed of a mat of dense fibers arranged in folds, designed according to federal standards to trap at least 99.97% of airborne particles measuring 0.3 microns in diameter: HEPA vacuums and air purifiers.

H(igh-)E(fficiency) P(articulate) A(ir)

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American Heritage
Abbreviations & Acronyms
  1. hamster egg penetration assay

  2. high-efficiency particulate accumulator

  3. high-efficiency particulate air

  4. high-efficiency particulate arresting

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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