Cleanroom Requirements & Classifications
What is an ISO Cleanroom?A cleanroom is a specially engineered enclosed area within a manufacturing or research facility. These rooms allow for precise control, monitoring, and maintenance of an internal environment. ISO classifications are specifically designed to regulate:
Clean Air Products is Your Source for Cleanroom ISO Classification InformationAt Clean Air Products, we manufacture softwall cleanrooms and hardwall cleanrooms that comply with various ISO classifications, fs209e, and ISO cleanroom standards. From Class 4 cleanrooms that maintain meticulous cleaning standards to less strict Class 7 cleanrooms, Clean Air Products manufactures cleanrooms that will meet your application’s 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 888-985-7307, and we will be happy to discuss your cleanroom needs and answer any questions.
Table 1 – Maximum number of particles in air by ISO class of cleanroom
Cleanroom Industry Requirements & ClassificationsCleanroom requirements are classified according to the number and size of particles permitted per volume of air in a specific amount of time. Our engineers can provide guidelines and ISO class code descriptions for the class of cleanroom required for your specific application. The government requires many industrial businesses to maintain specific cleanroom standards. For example, government regulation USP 797 outlines the requirements for pharmaceutical product manufacturing.
Cleanroom industry requirements are classified according to ISO 14644-1 cleanroom standards, which specify 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). Cleanroom 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. Most cleanrooms fall into the class 6,7 or 8 categories.
Cleanroom ISO Class Code DescriptionsMultiple factors should be considered when determining the correct cleanroom standards for a new product or business, including process requirements, cost, performance, and construction. Clean Air Products staff members work with you to review selection basics and all applicable cleanroom industry requirements. Clean Air Products provides cleanrooms by ISO class and additional cleanroom accessories to guarantee superior air quality and particle filtering.
The following cleanroom 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%
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. Specific test methods for these three classifications are outlined in 14644-3:2005.
Cleanroom Classifications for As-Built SystemsMost cleanrooms are rated and sold in the as-built category, categorized as an empty room with the filter system running, but without workers and production equipment. However, adding workers and equipment will introduce contamination and affect the room rating. A clean room may be rated ISO 6 at rest but at ISO 7 during operation (see Table 1).
In addition, cleanroom airflow performance can be cost-effectively upgraded by adding fan filter modules (FFM). For example, FFMs cover approximately 5-15% of an ISO class 8 cleanroom requirement for ceilings. Upgrading to an ISO 7 cleanroom requires 15-25% ceiling coverage, and covering 25-40% of the ceiling changes the room to an ISO 6 Class (see Table 2).
Recommended Air Changes Per Hour for Cleanrooms