Tue Sep 28, 2021

clean room classifications

Clean room classifications and requirements

ISO classifications are based on international standards that regulate the acceptable cleanliness levels of each level of room. International Organization for Standardization SO 14644-1 provides the guidance for the acceptable air quality levels within the specific clean room ISO classes. Moreover, the cleanroom class is determined by the level of cleanliness the room complies with, according to the quantity and size of particles per volume of air.
At Accumax India,we can manufacture clean rooms that comply with various ISO classifications, fs209e and ISO cleanroom standards. Whether you are looking for a less strict class 7 or 8 clean room, or require a class 4 that maintain the strictest cleaning standards,Accumax India manufactures clean rooms to your exact specifications.
Contact us for more information regarding clean room ISO classes, standards and the advantages of each type of ISO class of clean room. Or call us at +918860330056 and we will be happy to discuss your clean room needs and answer any questions that you may have.

What is an ISO Clean Room? 

A cleanroom is a specially engineered and carefully designed enclosed area within a manufacturing or research facility. These rooms allow for precise control, monitoring, and maintenance of an internal environment. The numerous ISO classifications are specifically designed to regulate: 

  • Temperature
  • Humidity
  • Airflow
  • Filtration
  • Pressure

 Each room requires a different level of cleanliness depending on the industry and application.


Cleanroom Industry Requirements & Classifications

Cleanroom requirements and standards are classified according to the number and size of particles permitted per volume of air in a specific amount of time. Accumax India engineers can provide guidelines and ISO class code descriptions for the class of cleanroom required for your specific application. Typically, businesses and organizations are aware of their cleanroom performance requirements because of customer, industry or government specifications..
Cleanroom industry requirements are classified according to ISO 14644-1 cleanroom standards, which specifies basic requirements for cleanroom operations. Federal Standard 209E is still also used (see Table 1).

ISO cleanroom classifications are rated according to how much of a particulate of a specific size exists per cubic meter, within a given enclosure (see second chart). Clean room classifications are based on an eight class rating system, with an ISO class 1 cleanroom being rated the most particle-free and ISO class 8 allowing the most particles. This cleanroom standard rating system provides the necessary information to make an informed decision based on your product needs. Most clean rooms fall into the class 6,7, or 8 categories.


ISO Cleanroom Standards & Requirements

A cleanroom’s performance requirements identify the cleanroom class level required at a given state or condition. There are three levels of condition (states) for testing and characterizing the performance of cleanrooms: as-built, at rest and operational.

Cleanroom ISO Class Code Descriptions

Determining the correct cleanroom standards for a new product or business requires balancing many aspects. These can include process requirements, cost, performance and construction.Accumax India staff members work hands-on with you to review the basics of selection, and all applicable clean room industry requirements. Accumax India provides cleanrooms by ISO class, as well as additional cleanroom accessories to guarantee superior air quality and particle filtering. The following clean room classifications provide the recommended air changes per hour, per class of cleanroom:

  • ISO Class 1 - The “cleanest” cleanroom is ISO 1, used in industries such as life sciences and electronics that require nanotechnology or ultra-fine particulate processing. The recommended air changes per hour for an ISO class 1 clean room is 500-750, and the ceiling coverage should be 80–100%.
  • ISO Class 2 - 500-750 air changes per hour, with a ceiling coverage of 80-100%.
  • ISO Class 3 - 500-750 air changes per hour, with a ceiling coverage of 60-100%.
  • ISO Class 4 - 400-750 air changes per hour, with a ceiling coverage of 50-90%.
  • ISO Class 5 - 240-600 air changes per hour, with a ceiling coverage of 35-70%.
  • ISO Class 6 - 150-240 air changes per hour, with a ceiling coverage of 25-40%.
  • ISO Class 7 - 60-150 air changes per hour, with a ceiling coverage of 15-25%.
  • ISO Class 8 - 5-60 air changes per hour, with a ceiling coverage of 5-15%.


Clean Room ISO Classifications & Industrial Applications 

Clean room design standards are utilized for a wide range of industries and applications. Each industry maintains specific clean room ISO requirements for their application needs. The clean room ISO classes that are utilized for certain industries are described below.


Due to numerous influences including temperature, humidity, EMI and static electricity, electronics production quality can suffer if the production room conditions are not pristine. Depending on the specificities of the electronic hardware that is being manufactured, cleanrooms in the range of ISO class 1-6 are generally recommended. 

Food Manufacturing 

Facilities that manufacture food and beverage products for human consumption are required to maintain certain levels of sanitation. ISO classes for cleanrooms in this industry differ widely due to the varying sensitivity of different food products to contamination. 


Parts and components that power contemporary cars, trucks and motorcycles are highly sensitive and require manufacturing facilities that maintain ISO class facilities for part production. The automotive industry generally utilizes cleanroom facilities between Class 6 and Class 9, depending on the part being manufactured.


Organic matter, including live cells, bodily fluids, chemicals and compounds require extremely clean environments that provide high levels of contamination protection. Cleanrooms in the life sciences field are most often specified between ISO Class 5 and Class 8.

Contact Accumax India for Clean Room ISO Classes & Options Today

Contact Us for more information regarding our ISO standards for clean rooms and ISO cleanroom manufacturing capabilities or request a quote for further pricing details today.