Overview

Cleanrooms may be super big. Entire manufacturing facilities may be contained in the cleanroom by having mill floor covering hundreds to thousands of square meters. It is utilized extensively within semiconductor manufacturing, biotechnology, the life sciences and other fields that may be sensitive to environmental contamination.

A air entering a cleanroom from either outside is filtered to exclude dust, and a air in is constantly recirculated across high efficiency particulate air (HEPA) and ultra online penetration air (ULPA) filters to dislodge internally generated contamination. Staff enter & leave across air locks (sometimes including an air shower stage), & have on hard wear like hats, face masks, boots and handle-alls. Devices in a cleanroom is designed to generate minimum air contamination. Most common materials like paper, pencils, and fabrics made from either natural fibre come typically excluded. Online-subordinate cleanrooms come typically non sterile (i.e., unhampered uncontrolled bug) & additional attention is given to airborne dust.

Cleanroom HVAC systems often control a humidity to low levels, such that additional precautions come necessary to halt electrostatic discharges.

Typing the cleanroom unremarkably takes wearing the cleanroom suit.

Cleanroom classifications
A as punishment is adapted from either [http://www.rockwellautomation.com/anorad/guide/cleanroom_criteria.html Rockwell Automation]:

A cleanroom standards tables suggest a maximal total of permissible particles of the indicated size by the cubic foot (for even Me FED) or cubic meter (for ISO) for every class. US FED STD 209E cleanroom standards
NOTE: Me FED STD 209E was canceled November 29, 2001. Information: http://www.iest.org/publctns/fedstd209.htm

ISO 14644-1 cleanroom standards

Cleanroom class comparison