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The following article presents a basic overview of common questions relating to the classification of a cleanroom.


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What is a Cleanroom?

With an increasing emphasis on maximizing product yield, improving quality control and ensuring safety, companies throughout many industries are looking to install cleanrooms or controlled environments in their facilities. No longer are cleanrooms limited to high tech semiconductor manufacturing or university research labs. Today, cleanrooms are being used in all types of environments.

What is a Cleanroom?
cleanroom classification

Choosing a Cleanroom Classification

There are a lot of determining factors involved in choosing a cleanroom classification and every industry has a default standard to start with. In medical device packaging for instance, the default classification is ISO 7 (or a class 10,000) cleanroom.


How do you choose the correct cleanroom to meet your needs? What are the determining factors that will decide the level of cleanroom you need, or if your operations would be better suited with a controlled environment instead?

The cleanroom you may need is going to be determined by several different factors:

  • Industry Standards
  • Government Regulations
  • Customer Requirements
  • Ease of Cleaning
  • Restriction of Access
  • Particulates
  • Temperature
  • Humidity
  • Microorganism

Once all of these factors are considered, you can then make accurate choices regarding the scope of the cleanroom operation you should implement, or whether your operations would be better suited with a controlled environment instead.

ISO 6 Class 1,000 Cleanroom

Ask our Experts - Cleanroom Classification

Here are two videos in our cleanroom series. For more videos and information regarding cleanrooms, visit our PortaFab Youtube Channel.

how to choose a cleanroom classification part 1

How to Choose a Cleanroom Classification (part 1)

What are the particles that your cleanroom needs to filter out, and what level of cleanroom best accomplishes that need? 

how to choose a cleanroom classification part 2

How to Choose a Cleanroom Classification (part 2)

What is the default need for your industry? What are the contamination issues that you will need to control?

cleanroom standards - how to choose a cleanroom

PortaFab Case Studies - Cleanroom Considerations

When considering a certain ISO classification of cleanroom it is critically important to ensure that your operation’s needs align with the scope of the ISO level you select. For example, choosing a cleanroom that is more robust than the needs of your operation may make it difficult to meet the ROI of the cleanroom. Additionally, selecting a cleanroom that does not meet the needs of your operations can lead to the contamination of your products or services, which will incur further costs and may affect future customer relations. For examples of our cleanroom solutions in action, listed below are several cleanroom case studies.

ISO 8 Class 100,000 Cleanroom

ISO 8 (Class 100,000 Cleanroom)

Vesta required complete environmental control with ISO 8 validation in order to completely contain one of their manufacturing processes.

ISO 7 Class 10,000 Cleanroom

ISO 7 (Class 10,000 Cleanroom)

Young Dental required multiple clean environments in which to contain each stage of the manufacturing process from initial mixing to product packaging.

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ISO 6 Class 1,000 Cleanroom

ISO 6 (Class 1,000 Cleanroom)

Pozzetta Micro Clean required the quick creation of a modular cleanroom that would aid in their new cleaning service targeted at semiconductors, microelectronics, and medical products.

ISO 5 Class 100 Cleanroom

ISO 5 (Class 100 Cleanroom)

Ampex Recording Media Corporation required a high-quality yet flexible cleanroom to accommodate their expanding tape manufacturing operation.

cleanroom environmental control - PortaFab Cleanrooms

How Contamination Relates to Cleanroom Classification

A typical cleanroom is designed to keep the outside environment from getting in. Once an environment has been built, the two things that cause contamination in it are the people and the process. So the questions are, what contamination is generated by people, and what contamination is generated by the process.

cleanroom garmenting, propper cleanroom garmenting

Propper Garmenting

Often times one can build a lower classification of cleanroom, though still maintain a cleaner environment by enhancing operations within the cleanroom - for instance, garmenting workers to a higher standard.

cleanroom air control, how to control air in a cleanroom

Air Control

Positioning return air grills and filtration systems at optimal locations within the cleanroom can result in cleaner areas within the environment, thus bringing the cleanroom classification to a lower level in those areas.

Understanding the contamination sources and combating those with solid cleanroom design and enhanced operations can provide significant cost savings from both construction and operational standpoints. 

How cleanrooms control particle size, how big is a particle, PortaFab Cleanroom

How Particle Size Impacts Classification

One of the most important factors to determine when constructing a cleanroom is what size of particle will need to be filtered out. Is it any size particle? Is it a specific size or range of particles? Often times, people look at the cleanroom classification (see chart below) and they go to the lowest level particle count to determine what classification they need.

ISO 5 Class 100 cleanroom

How to Choose the right ISO Level

An example of this would be someone that determines they need less than 100 particles per square foot within their cleanroom. Based on this information, they determine that the classification will need to be an ISO 5 (or class 100) cleanroom. However, an issue can arise if they do not take into account the size of the particle they are trying to filter out.

ISO 8 Class 100,000 cleanroom classification

Micron Size can determine ISO Levl

There’s a significant difference in the classification that is needed if that particle is 1/2 micron in size versus 5 microns in size (see Micron description below). If they think they’re looking at a ½ micron sized-particle, but really the particle that is a problem for them is a 5 micron particle – From a cleanroom classification, this doesn’t translate to an ISO 5 cleanroom (or class 100). This actually translates into an ISO 8 cleanroom (or class 100,000).

In the cleanroom environment, air particles are measured in microns. One micron equals one-millionth of a meter. Micron-sized particles are smaller than a living cell and can be seen only with the most powerful microscopes.


To put this in perspective, a strand of human hair can vary in width from approximately 20 to 180 microns, while the average size is typically 50-70 microns.

  • One small dust particle seen in a ray of sun equates to approximately 60 microns.
  • The human eye cannot consistently see objects less than 50 microns in size.
  • Pollen is approximately 30-50 microns.
  • Bacteria are approximately 2 to 10 microns in size.
  • A typical indoor air sample may contain anywhere from 500,000 to 1 million particles per cubic foot of air.
how large is a micron, how do cleanrooms control microns

By comparison, an ISO class 5 cleanroom is designed to allow no more than 3,520 particles equal to or larger than 0.5 microns per cubic meter of air. This equates to a Class 100 cleanroom under the Federal Standard 209E, which allows for 100 particles (0.5 microns or larger) per cubic foot of air.

How does air circulation affect cleanroom classification - Controlling air inside a cleanroom

How Air Circulation Affects Classification

Any time the classification goes down a class, or up a class - for instance from an ISO 8 (class 100,000) to an ISO 7 (class 10,000) - that’s going to take twice as much air. The cost of filtering and moving air is a significant cost of operating a cleanroom. This process translates all the way down through to the number of filters that are needed, the amount of return air space that is needed, the amount of air conditioning that will be needed to cool that return air and so forth. And this multiplies itself as one goes through the process.


A common mistake involves a client asking for a cleanroom that is too tall, or otherwise in excess of what they really need. If you require a cleanroom with an 8-foot ceiling height, but decide to make it taller in order to align better with the surrounding environment and make it 10-feet high, that changes the volume of the area by 25%. Therefore they’re increasing the amount of air needed for that cleanroom by 25% because they decided on building a 10-foot height, when they only needed an 8-foot height.

What would seem to be a simple difference (moving from one class to the other) significantly changes the cost of a cleanroom - almost 25% for the same sized cleanroom at the same classification.

Single Pass Air Circulation design for clean rooms

Controlling Temperature, Humidity, & Airflow

Controlling the environment within a clreanroom is critical to the success of a cleanroom and operations that take place within it. Provided below are two videos that go into further depth regarding controlling a cleanroom environment. For more videos and information regarding cleanrooms, visit our PortaFab Youtube Channel.

does air flow affect cleanroom construction or design costs?

Does Air Flow Affect Cleanroom Construction or Design Costs?

Single Pass Design vs. Recirculating Air Design. Which type is the right choice for your cleanroom?

how cleanroom temperature and humidity affect costs - cleanroom considerations

How Cleanroom Temperature and Humidity Affect Costs

Tolerance will determine the temperature and humidity needs that your cleanroom will need. 

cleanroom standards, standards to consider when choosing a cleanroom

Cleanroom Standards for Classification

For those companies that need to adhere to specific cleanroom design standards, they must understand that cleanrooms can be built and operated to meet different cleanliness classifications, depending on the environmental conditions required for their use. The primary authority for clean room classifications is the International Organization for Standardization or ISO.

ISO 14644-1 Cleanroom Standards


maximum particles / m3


≥0.1 µm

≥0.2 µm

≥0.3 µm

≥0.5 µm

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≥5 µm
























Class 1 Cleanroom








Class 10 Cleanroom








Class 100 Cleanroom








Class 1,000 Cleanroom








Class 10,000 Cleanroom








Class 100,000 Cleanroom








Room air

(µm denotes micron particle size)

ISO 14644-1 classifies a cleanroom based on the size and number of airborne particles per cubic meter of air (see chart above).

Prior to the implementation of ISO 14644-1, US Federal Standard 209E set the industry guidelines for cleanroom classification, and denoted the number of particles 0.5µm or larger per cubic foot of air. For instance, under FED-STD-209E, a "class 1000 cleanroom" would indicate 1,000 particles 0.5 µm or smaller in each cubic foot of air. FED-STD-209E was officially cancelled on November 29th, 2001, though both standards are still widely used.

controlled environment vs cleanroom - Do I need a cleanroom?

Save Costs with a Controlled Environment

One of the reasons for the development of the ISO standards was to accommodate an environment called “ISO Class 9” which was never a cleanroom classification before. This classification translates roughly into what the pharmaceutical industry calls a “controlled and classified area.”


By controlled and classified, this means that it is controlled to a particle level (via HEPA air filtration), its controlled to the temperature and humidity that has been specified, but it’s not classified in terms of the particle count. A “controlled and classified area” is pressurized, it features temperature control and the air is filtered. It is just not specified in terms of the amount of and size of particles within a given volume of air.

In many cases, this type of environment is all that a client needs in terms of a “cleanroom”. If a company is not careful, they can end up building a cleanroom far beyond their actual requirements and there are dramatic costs involved with doing that.

clean room environment - PortaFab
Cleanroom considerations - things to consider when building a cleanroom - what to add to a cleanroom

Cleanroom Considerations - Additional Reading

Do you want to know about the additional types of cleanrooms, or the various components that can be added to ensure that your processes, products, and technicians are ISO compliant? Listed below are several different links you can follow to learn more about the additional products and systems that PortaFab can offer for your cleanroom build.

Negative Pressure Airborne Infection Isolation Rooms - Negative Pressure Cleanrooms

Negative-Pressure Airborne Infection Isolation Rooms

Is controlling the air pressure of your cleanroom important? Do your operations require that outside air does not enter the cleanroom, or that any volatile chemicals or microorganisms not leave the cleanroom? Read more about controlling the air pressure of your cleanroom here - Negative-Pressure Airborne Infection Isolation Rooms.


Modular Cleanrooms - Modular Cleanroom Applications - Modular Cleanroom Solutions

PortaFab’s Modular Clean Rooms

Modular Cleanrooms provide an excellent alternative to traditional construction methods. They are simple to install, require no cutting, create no debris, and can be relocated with ease giving your operations a degree of versatility that a permanent-non moveable construction would not be able to offer. Follow this link to learn more about PortaFab’s Modular Clean Rooms.


Cleanroom Components - Things to add to a cleanroom - What components does a cleanroom require?

Clean Room Components

Cleanroom Operations often consist of several different components working simultaneously to ensure that processes or products are protected. If your cleanroom requires additional components, PortaFab has several different solutions that you can use to enhance your build - Clean Room Components.


How to construct a cleanroom - What is required to make a cleanroom - Cleanroom Construction Tips

Cleanroom Construction Expertise

For over 30 years, PortaFab has been helping organizations with all of their clean room and environmental control needs. Our staff of design consultants work with architects and general contractors to deliver functional and cost-effective solutions, resulting in a smooth and quick cleanroom construction process. Read more here - Cleanroom Construction Expertise.


Cleanroom Information - Cleanroom Articles - Cleanroom Frequently Asked Questions

PortaFab’s Cleanroom Learning Center

Do you have more questions regarding cleanrooms or controlled environments? PortaFab’s Cleanroom Learning Center has several resources that can help answer your questions.