HEPA
A high-efficiency particulate air filter captures at least 99.97% of airborne particles 0.3 micrometers in diameter under the U.S. standard. It traps particles through diffusion, interception, and impaction rather than acting as a simple sieve.
A high-efficiency particulate air filter captures at least 99.97% of airborne particles 0.3 micrometers in diameter under the U.S. standard. It traps particles through diffusion, interception, and impaction rather than acting as a simple sieve.