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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 ...
Automotive cabin air filters. [edit] The cabin air filter, also known in the United Kingdom as a pollen filter, is typically a pleated-paper filter that is placed in the outside-air intake for the vehicle's passenger compartment. Some of these filters are rectangular and similar in shape to the engine air filter.
HEPA (/ ˈ h ɛ p ə /, 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.
High Pressure Pure Air Generator (HiPPAG®) is a registered trade mark belonging to Ultra Electronics for a type of Pure Air Generating System (PAGS). HiPPAG® is an integrated pure air compressor and filtration system, which continuously consumes atmospheric air during flight or on the ground, and then provides high pressure pure air to cryogenically cool the infrared detector in missile systems.
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.
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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 ...
In her four-chapter series called “The Pigment Change,” rather than developing photos on photographic paper, she prints them directly onto plants. “I just put a negative on top of the leaf ...
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