Air purifier
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An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed to people with allergies or asthma, and
A Sharp FU-888SV Plasmacluster air purifier.
The same air purifier, cover removed.
Air-purifiers with air flow generated by bladeless fan. Some models can act as heaters or humidifiers and may feature oscillation and adjustment of air flow angle (up and down).
An air purifier placed under a table
HEPA
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HEPA is an efficiency standard of air filters. A HEPA filter is an air filter meeting such a standard.
Air purifier
…combination of protective features of the Stenhouse's respirator and other breathing devices. This invention was later described in 1875. In the 1950s, HEPA filters were commercialized as highly efficient air filters, after being put to use in the 1940s in the United States' Manhattan Project to control…
A portable HEPA filtration unit used to clean air after a fire, or during manufacturing processes
Hospital staff modelling a powered, air-purifying respirator (PAPR) fitted with a HEPA filter, used to protect from airborne or aerosolised pathogens such as tuberculosis
HEPA original filter for Philips FC87xx-series vacuum cleaners