HEPA - Wikipedia
Vacuum cleaners simply labeled "HEPA" may have a HEPA filter, but not all air necessarily passes through it. Finally, vacuum cleaner filters marketed as "HEPA-like" will typically use a filter of a …
What is a HEPA filter? | US EPA
Aug 15, 2025 · HEPA is a type of pleated mechanical air filter. It is an acronym for "high efficiency particulate air [filter]" (as officially defined by the U.S. Dept. of Energy).
How do HEPA air filters work? - Explain that Stuff
Aug 4, 2024 · If you suffer from asthma or another breathing difficulty, you may find a HEPA (sometimes defined as "high-efficiency particulate air," sometimes as "high-energy particulate arresting") air …
High-efficiency particulate air system (HEPA system) | Britannica
Dec 20, 2025 · High-efficiency particulate air system (HEPA system), particulate air-filtration system designed to capture at least 99.97 percent of fine airborne particles larger than at least 0.3 …
What is a HEPA filter and its benefits? - Dyson
HEPA (High Efficiency Particulate Air) is an air filter efficiency standard – a certification of a filter’s performance. HEPA is defined as a filter that captures 99.97 per cent of particles down to 0.3 …
What is a HEPA filter, and what is it used for? - TechRadar
May 11, 2025 · HEPA stands for 'high efficiency particulate air' [filter], and it's a standard for filter effectiveness. To be called a HEPA filter, a filter must meet stringent standards in terms of what it...
HEPA Air Filters for the Home: What They Do and How to Get ...
Apr 9, 2025 · Learn about the evolution of HEPA technology, maintenance best practices, and how to choose the right system for cleaner, healthier indoor air.
What is a HEPA Filter and How Does it Work? - Smart Air
Apr 17, 2024 · HEPA filters are high efficiency filters that typically capture over 99.5% of all particulate pollution. They’re made from either plastic (PP+PET) or fiberglass, and can capture things like …
Understanding HEPA Filters: What is a HEPA Filter and Why It ...
Dec 5, 2025 · What is a HEPA Filter? HEPA stands for High Efficiency Particulate Air. A true HEPA filter captures at least 99.97% of airborne particles measuring 0.3 microns—widely known as the most …
Hepatitis A Vaccine VIS | Vaccines & Immunizations | CDC
Jan 31, 2025 · Hepatitis A vaccine Children need 2 doses of hepatitis A vaccine: First dose: 12 through 23 months of age Second dose: at least 6 months after the first dose Infants 6 through 11 months old …