HEPA - High Efficiency Particulate Air. See also Filter, High Efficiency Particulate Air.
Housing, Filter - A device used to hold a filter.
IEST - Institute of Environmental Sciences and Technology. The organization which historically sets standards for high efficiency air filters.
Impingement - The process in which particles are removed from an airstream because of their inertia. As air containing a particle flows toward a filter fiber or other collecting surface, the particle does not follow the airstreamlines because of its inertia. Instead it moves in a straight line colliding with the filter fiber or surface to which it may become attached.
Inches of Water Gauge (w.g.) - A unit of measuring pressure or pressure differential (1in.w.g. = 0.036psi).
Interception - The process in which a particle is removed from an airstream as it follows the streamlines around a filter. The particle comes in contact with a fiber and stays attached to it because the attractive forces between the fiber and the particle are stronger than the forces of disruption of the moving airstream.
J -No entry
K - No entry
Laminar Flow - Air that flows in a single pass, in a single direction, with uniform velocity through a cleanroom or clean zone with generally parallel streamline. See also Unidirectional Airflow
Magnehelic® Gauge - Registered trade name for a diaphragm activated dial gauge that measures changes in air pressure. These readings can translate into several measurements that include filter resistance, air velocity, fan and blower pressures, and furnace draft.
Make-Up Air - Unfiltered air that is introduced into a re-circulated air system.
Manometer - An instrument for measuring pressure of gases and vapors. Gas pressure is balanced against a column of liquid in a U-shaped tube
Medium - The filtering material in a filter (plural: media).
Micrometer - (µm, often abbreviated as um, micron or µ) A unit of measurement of length, equal to one-millionth of a meter (approximately 0.00003937 inch).
Micron (µm) - (micrometer often abbreviated as um, micron or µ) A unit of measurement of length, equal to one-millionth of a meter (approximately 0.00003937 inch).
Mini-Environment - An environment that provides localized control of airborne contaminants by means of an enclosure designed to isolate product-handling areas from personnel and the surrounding room environment.
Most Penetrating Particle Size (MPPS) - The size of the particles that achieve maximum penetration of the filter medium. Particles that are smaller or larger than the most penetrating size exhibit a lower rate of penetration; the reduced penetration of the smaller particles is due to diffusion mechanisms, while for the large particles it is due to interception and inertial effects. The most penetrating size is a function of the structure of the filter medium, the velocity of the airflow through the filter, and the physical and chemical nature of the particles.
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