ISO 14644 (Cleanrooms)

What does ISO 14644 define?

ISO 14644-1:2015 classifies air cleanliness by the concentration of airborne particles in cleanrooms, clean zones and separative devices. It provides ISO Classes 1 through 9 using specified threshold particle sizes from 0.1 µm to 5 µm and defined sampling methods. It does not characterize the physical, chemical, radiological or viable nature of those particles. ISO 14644-2:2015 addresses monitoring to provide evidence of performance related to air cleanliness by particle concentration; other parts cover test methods, design, construction and operations.

Why might a medical device manufacturer use a cleanroom?

A controlled environment may be needed when product quality or process validation depends on limiting particles or other contamination during assembly, packaging or testing. The necessary control depends on the device, exposed surfaces, manufacturing steps, sterilization strategy and risk analysis. There is no universal rule that medical-device assembly must use ISO Class 7 or 8. Airborne-particle classification also does not establish acceptable microbial contamination; viable monitoring and bioburden controls require separate methods, limits and justification.

Is ISO 14644 legally required for sterile devices?

Not automatically. Device regulations and quality-system requirements generally require manufacturers to control the production environment where environmental conditions could adversely affect product quality. ISO 14644 can be a recognized way to specify and demonstrate particle cleanliness, but the applicable legal, regulatory, customer and product requirements must be assessed for each facility and process. Sterilization validation under standards such as ISO 11135, ISO 11137 or ISO 17665 does not by itself prescribe one ISO cleanroom class.

What belongs in a cleanroom control package?

The package should define the cleanliness class and occupancy state, room boundaries, sampling locations, test methods and acceptance criteria; document initial classification; and establish monitoring under ISO 14644-2 for the parameters needed to show particle-cleanliness performance. Separate procedures may address pressure, airflow, recovery, temperature, humidity and viable contamination when the process requires them. Excursions need documented investigation, product-impact assessment and requalification criteria. Manufacturers serving the United States or European Union should connect those records to the applicable QMS and technical documentation rather than present the ISO certificate as a standalone regulatory authorization.