HEPA stands for ā€œhigh-efficiency particulate airā€ and is a technology, originally developed by the nuclear industry to clean up dangerous, radioactive particles, that also very effectively filters out and traps household particles in the air through the use of dense interlaced fibers.

Furnace Filter Change

Introduction: Understanding HEPA Filters and Their Origins

In fact, unlike traditional high-efficiency filters, which remove only about 95% of pollutants down to 1 micron in size, HEPA filters are so effective, they remove about 99.97% of particles down to 0.3 microns from the air.

How HEPA Filters Work: A Powerful Technology for Air Filtration

How small are the particles HEPA filters capture? Really small! To give you some perspective, while a human hair is about 50 to 150 microns in diameter, HEPA technology can trap 99.97% of particles that are about 0.3 microns in diameter or larger, hundreds of times smaller.

Particle Size Matters: HEPA Filters Capture Micron-Sized Particles

So, how big are the particles HEPA filters trap?

  • Mold Spores: 3-12 microns
  • Bacteria: 0.3-60 microns

Identifying Genuine HEPA Filters: Beware of “HEPA-like” or “HEPA-type” Products

Make sure when buying HEPA filters to avoid products with terms like ā€œHEPA-likeā€ or ā€œHEPA-typeā€. A genuine HEPA filter will indicate that it filters at least 99.97% of particles at 0.3 microns.

For even more great information about Indoor Air Quality and Air Purification, be sure to read our Ultimate Guide to Indoor Air Quality.

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