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2. Air filtration in operating rooms - Wikipedia

   en.wikipedia.org/wiki/Air_filtration_in...

   High-efficiency particulate air (HEPA) filter is at least 99.97% effective in removing particles ≥0.3 μm in diameter (as a reference, Aspergillus spores are 2.5–3.0 μm in diameter). High-level HEPA filtration and increasing air changes per hour (ACH) can reduce particulate matter (PM) and bacterial concentrations in the operating room.

3. HEPA - Wikipedia

   en.wikipedia.org/wiki/HEPA

   HEPA filters are designed to arrest very fine particles effectively, but they do not filter out gasses and odor molecules. Circumstances requiring filtration of volatile organic compounds, chemical vapors, or cigarette, pet or flatulence odors call for the use of an activated carbon (charcoal) or other type of filter instead of or in addition to a HEPA filter. [20]

4. Fan filter unit - Wikipedia

   en.wikipedia.org/wiki/Fan_filter_unit

   Fan filter unit. A fan filter unit ( FFU) is a type of motorized air filtering equipment. It is used to supply purified air to cleanrooms, laboratories, medical facilities or microenvironments by removing harmful airborne particles from recirculating air. [1] The units are installed within the system's ceiling or floor grid.

5. Minimum efficiency reporting value - Wikipedia

   en.wikipedia.org/wiki/Minimum_Efficiency...

   Minimum Efficiency Reporting Value, commonly known as MERV, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers ( ASHRAE) to report the effectiveness of air filters in more detail than other ratings. For example, often a high-efficiency particulate air ( HEPA) filter is ...

6. Heat recovery ventilation - Wikipedia

   en.wikipedia.org/wiki/Heat_recovery_ventilation

   Heat recovery ventilation. Heat recovery ventilation ( HRV ), also known as mechanical ventilation heat recovery ( MVHR) or energy recovery ventilation ( ERV ), is a ventilation system that recovers energy by operating between two air sources at different temperatures. It is used to reduce the heating and cooling demands of buildings.

7. The best Walmart deals under $100 to shop right now ... - AOL

   www.aol.com/lifestyle/best-walmart-deals-under...

   Walmart. Travelhouse Hardside Luggage Set, 3-Pieces. $86 $350 Save $264. If your current bags have seen better travel days, it's time to level up with a truly incredible deal. The bestselling ...