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2. Rheem Manufacturing Company - Wikipedia

   en.wikipedia.org/wiki/Rheem_Manufacturing_Company

   Website. www .rheem .com. Rheem Manufacturing Company is an American privately held manufacturer that produces residential and commercial water heaters and boilers, as well as heating, ventilating and air conditioning (HVAC) equipment. The company also produces and sells products under the Ruud brand name.

3. NIOSH air filtration rating - Wikipedia

   en.wikipedia.org/wiki/NIOSH_air_filtration_rating

   These HE-marked filters are 99.97% efficient against 0.3 micron particles and are oil-proof, and therefore their filter-media material has the exact same specification as a P100 filter. [9] [10] [11] Since filters are tested against the most penetrating particle size of 0.3 μm , an APR with a P100 classification would be at least 99.97% ...

4. Air filter - Wikipedia

   en.wikipedia.org/wiki/Air_filter

   A particulate air filter is a device composed of fibrous, or porous materials which removes particulates such as smoke, dust, pollen, mold, viruses and bacteria from the air. Filters containing an adsorbent or catalyst such as charcoal (carbon) may also remove odors and gaseous pollutants such as volatile organic compounds or ozone. [1]

5. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   A common size for cells inside cordless tool battery packs. This size is also used in radio-controlled scale vehicle battery packs and some Soviet multimeters. 1 ⁄ 2-, 4 ⁄ 5 - and 5 ⁄ 4-sub-C sizes (differing in length) are also available. Soviet 332 type can be replaced with R10 (#4, 927, BF, U8) or 1.5 V elements from 3 V 2xLR10 packs. D

6. Ultra-low particulate air - Wikipedia

   en.wikipedia.org/wiki/Ultra-low_particulate_air

   Ultra-low particulate air ( ULPA) is a type of air filter. A ULPA filter can remove from the air at least 99.999% of dust, pollen, mold, bacteria and any airborne particles with a minimum particle penetration size of 120 nanometres (0.12 μm, ultrafine particles ). A ULPA filter can remove—to a large extent but not 100%—oil smoke, tobacco ...

7. HEPA - Wikipedia

   en.wikipedia.org/wiki/HEPA

   HEPA ( / ˈhɛpə /, high-efficiency particulate air) filter, [1] also known as high-efficiency particulate absorbing filter [citation needed] and high-efficiency particulate arrestance filter, [2] is an efficiency standard of air filters. [3] Filters meeting the HEPA standard must satisfy certain levels of efficiency.