Technical Glossary Q-Z

Glossary of Terms:

Danforth Air Filtration & Air Purification
Air Filter & Air Purifier Related Glossary Of Terms

by Richard Carrow (Danforth Air Filtration & Air Purification, Buffalo, NY)

Air Filter/Filtration, Air Cleaner & Air Purifier/Purification Definitions:
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Q - No Entry

Recommended Practice - A published document that provides technical guidance, philosophy or preferred procedures regarding a given topic.

Resistance (Filter) - See: Pressure Drop

Roughing Filter - A prefilter with high efficiency for large particles and fibers but low efficiency for small particles, usually of the panel type.

Scan - A method for disclosing leaks in filter units in which the probe nozzle of an aerosol photometer is held approximately one inch from the area to be tested and moved at a rate of not more than 10 ft/min (3 m/min) across the test area. Also known as probing.

Specification, Design - A concise document that provides the requirements for a product´s construction and performance.

Standard Air - Air at 50% relative humidity, with a temperature of 21ºC (69.8ºF) and pressure of 760 mm Hg (29.92 in Hg.).

Standard Air Density - Air having a density of approximately 1.201 Kg/m³ (0.075 lb/ft³); that is, standard air with a specific volume of 0.832 m³/kg (13.33 ft ³/lb).

Static Pressure - The potential pressure exerted in all directions by a fluid. For a fluid in motion it is measured in the direction normal to the direction of flow.

T - No entry

ULPA - Ultra Low Penetration Air, also see Filter, Ultra Low Penetration Air

Ultrafine Particles - Particles in the size range from approximately 0.02µm to the upper limit of detectability of the discrete particle counter.

Unidirectional Airflow - Air that flows in a single pass, in a single direction, with uniform velocity through a cleanroom or clean zone with generally parallel streamlines. Formerly referred to as Laminar Flow.

Uniform Airflow - Unidirectional airflow pattern in which the point-to-point readings are within plus or minus 20% of the average airflow velocity for the total area of the laminar flow work zone.

Velocity - The distance traveled in a given time. Air velocity is measured in feet per minute (FPM) or meters per second (m/s).

Water Gauge (w.g.) - A means of designating pressure or differential pressure in terms of the height of an equivalent column of water, commonly expressed as inches w.g. in the English system (1 inch = 0.036psi).

Work Zone - The space or volume within the cleanroom that is designated for contamination-controlled operations, and for which cleanliness testing is required

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Danforth Air Filtration & Air Purification - Replacement Air Filters, HEGA Air Purifiers, & Associated Filters. NAFA Certified Specialist For Residential, Commercial, & Industrial HVAC And HEGA Air Purification

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