Clean Benches Specifications | GlobalSpec

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Laminar Flow Direction


			Generally defined, laminar airflow is airflow in which the entire body of air within a confined area moves in a unidirectional velocity along parallel flow lines. Technically defined, laminar airflow is the fluid flow in which air velocities are free of macroscopic fluctuations which occur when the Reynolds Number is less than 2000. (The Reynolds Number is the ratio of inertial to viscous forces in a pipe or duct.)
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	Horizontal		The clean bench is a work area with its own HEPA filtered air supply. Protection is provided by capturing room air, passing the air through a HEPA filter, and directing the filtered air horizontally across the work surface at a constant speed toward the user. These devices provide only product protection and can be used for certain clean activities, such as the dust-free assembly of sterile equipment or electronic devices.
	Vertical		The clean bench is a work area with its own HEPA filtered air supply. Protection is provided by capturing room air, passing the air through a HEPA filter, and directing the filtered air vertically across the work surface at a constant speed toward the user. These devices may be useful, for example, in hospital pharmacies when a clean area is needed for preparation of intravenous drugs.
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Air Cleanliness Class


	Air Cleanliness Class:		In Federal Standard No. 209E (last revised Sept.11, 1992) the United States Government provides requirements for three classes of air cleanliness. Classifications are based on particle counts taken at a location within the clean bench which will yield a particle count of air as it approaches the work location. It is important to note that government classifications reflect performance when the bench is "at rest", or free of materials or work activity within the hood.
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	Class 1 (ISO 3)		Class 1 or ISO 3 cleanrooms have a particle count that is not to exceed a total of 1 particle, 5 microns or larger in size, in a cubic foot of air.
	Class 10 (ISO 4)		Class 10 or ISO 4 cleanrooms have a particle count that is not to exceed a total of 10 particles, 5 microns or larger in size, in a cubic foot of air.
	Class 100 (ISO 5)		Class 100 or ISO 5 cleanrooms have a particle count that is not to exceed a total of 100 particles per cubic foot of a size 0.5 micron and larger.
	Class 1,000 (ISO 6)		Class 1,000 or ISO 6 cleanrooms have a particle count that is not to exceed a total of 1,000 particles, 5 microns or larger in size, in a cubic foot of air.
	Class 10,000 (ISO 7)		Class 10,000 or ISO 7 cleanrooms have a particle count that is not to exceed a total of 10,000 particles per cubic foot of a size 0.5 micron and larger, or 65 particles per cubic foot of a size 5.0 micron and larger.
	Class 100,000 (ISO 8)		Class 100,000 or ISO 8 cleanrooms have a particle count that is not to exceed a total of 100,000 particles per cubic foot of a size 0.5 micron and larger, or 700 particles per cubic foot of a size 5.0 micron and larger.
	Other		Other unlisted cleanliness class, examples include ISO 1, 2 and 9.
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Performance Specifications


	HEPA Filter Efficiency:		A common component in any clean bench is the HEPA filter. The HEPA filter (High Efficiency Particulate Air) removes particulates, generally called aerosols, such as micro-organisms, from the air. The HEPA filter does not remove vapors or gases. Depending on its quality, a HEPA filter can trap from 9,997 to 9,999 of every 10,000 particulates of a diameter greater than 0.3 microns. For most industrial use, the 99.97% performance is acceptable. Pharmacy and laboratory applications, however, require a 99.99% filtration performance level.
	Your choices are...
	99.97%		The HEPA filter can remove 9,997 of every 10,000 particulates of a diameter greater than 0.3 microns. For most industrial use, the 99.97% performance is acceptable.
	99.99%		The HEPA filter can remove 9,999 of every 10,000 particulates of a diameter greater than 0.3 microns. Pharmacy and laboratory applications, however, require a 99.99% filtration performance level.
	Other		Other filter type not stated.
	Search Logic:		Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Hood Face Velocity:		The velocity of air flow across the imaginary plane running between the bottom of the sash to the work surface.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

Features and Options


	Lighting?		The clean bench has integral lighting to facilitate work contained inside.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Pre-filter?		A pre-filter will extend the life of the HEPA filter.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.