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Varying standards define what qualifies as a HEPA filter. The two most common standards require that an air filter must remove (from the air that passes through) 99.95% (European Standard) [4] or 99.97% (ASME standard) [5] of particles that have a size greater than or equal to 0.3 μm.
AirDrop is a proprietary wireless ad hoc service in Apple Inc.'s iOS, macOS, iPadOS and visionOS operating systems, introduced in Mac OS X Lion (Mac OS X 10.7) and iOS 7, [1] which can transfer files among supported Macintosh computers and iOS devices by means of close-range wireless communication. [1]
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]
File 13" is a euphemism for the trash can. The phrase is especially used in the U.S. military, and is less common outside of the United States . In the United Kingdom , for instance, the expression " round file " or " circular file " is more common (in reference to trash cans typically being round).
The NIOSH air filtration rating is the U.S. National Institute for Occupational Safety and Health (NIOSH)'s classification of filtering respirators.The ratings describe the ability of the device to protect the wearer from solid and liquid particulates in the air.
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For example, six air changes per hour means an amount of new air, equal to the volume of the space, is added every ten minutes. For human comfort, a minimum of four air changes per hour is typical, though warehouses might have only two. Too high of an air change rate may be uncomfortable, akin to a wind tunnel which has thousands of changes per ...
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