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The MERV scale is designed to represent the worst-case performance of a filter when dealing with particles in the range of 0.3 to 10 micrometers. The MERV value is from 1 to 16. Higher MERV values correspond to a greater percentage of particles captured on each pass, with a MERV 16 filter capturing more than 95% of particles over the full range.
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On 4 July 2012, the discovery of a new particle with a mass between 125 and 127 GeV/c 2 was announced; physicists suspected that it was the Higgs boson. Since then, the particle has been shown to behave, interact, and decay in many of the ways predicted for Higgs particles by the Standard Model, as well as having even parity and zero spin, two ...
[4] The Facility Guidelines Institute recommends using sequential HEPA filters for ORs with a MERV rating of 7 (i.e., captures particle 10 to 3 μm in size) and 14 (i.e., captures particles from 1 to 0.3 μm in size). [5] One mechanism by which HEPA filters capture particles is electrostatic charge.
The defined particle size ranges are 0.09–1.0 μm for smoke, 0.5–3 μm for dust, and 5–11 μm for pollen. AHAM recommends following their '2/3' rule. Air filters should be chosen for rooms so that the value of its smoke CADR is equal to or greater than 2/3 the room area in units of square feet (valid for rooms up to 8-foot (2.4 m) in ...
The reading is taken from the scale marked next to the grooves, in dimensionless "Hegman units" (or National Standard units; NS) and/or mils or micrometres. [5] Hegman units are defined in terms of an inverted size scale as shown below: [6] Hegman Grind Gage and doctor blade Paint sample at top of Hegman Hegman after paint drawdown
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