FED-STD-209 E ''Airborne Particulate Cleanliness Classes in Cleanrooms and Cleanzones'' was a federal standard concerning classification of air cleanliness, intended for use in environments like

cleanrooms A cleanroom or clean room is an engineered space that maintains a very low concentration of airborne particulates. It is well-isolated, well-controlled from contamination, and actively cleansed. Such rooms are commonly needed for scientifi ...

. The standard based its classifications on the measurement of airborne particles.

Cancellation

The standard was canceled on November 29, 2001 by the United States

General Services Administration The General Services Administration (GSA) is an Independent agencies of the United States government, independent agency of the United States government established in 1949 to help manage and support the basic functioning of federal agencies. G ...

(GSA). The document was superseded by standards written for the

International Organization for Standardization The International Organization for Standardization (ISO ; ; ) is an independent, non-governmental, international standard development organization composed of representatives from the national standards organizations of member countries. M ...

(ISO).

References

External links

Institute of Environmental Sciences and TechnologyCritical Distinctions Between Clean Room Carts and Laboratory Carts

ISO 14644-1 Cleanroom Classifications
Air filters Standards of the United States Cleanroom technology {{Measurement-stub