In an era where advanced manufacturing technology and product safety standards are central to business competition, whether in the pharmaceutical, dietary supplement, cosmetic, or high-precision electronic component industries, "clean rooms" have become an indispensable factor in preventing contamination from dust, microorganisms, and small airborne particles.
However, one of the most common misconceptions among business owners and project managers is that "all clean rooms are the same." In reality, clean room standards are categorized into several levels, known as "Clean Room Classes," based on the purity of the air. Choosing the wrong class will not only fail your facility to meet international certifications (such as FDA or GMP), but choosing a class that is unnecessarily high will also result in massive long-term construction and electricity costs. This article will introduce you to each type of Clean Room Class and provide guidelines for selecting the most cost-effective and appropriate class for your industry.
The differences in Clean Room Class according to ISO 14644-1 standard.
The most widely accepted and used international standard for classifying cleanroom cleanliness is ISO 14644-1. The classification criterion considers the "particle count (from 0.1 microns to 5 microns per cubic meter of air)". The lower the ISO class number, the cleaner and purer the air inside the room.
In addition, some industries still prefer to refer to the original US standard, Federal Standard 209E (FS 209E), such as Class 100, Class 10,000, or Class 100,000, which can be compared to ISO standards as shown in the table below:
Comparison table of Clean Room Class standards (ISO 14644-1 vs FS 209E)
| ISO Standard (ISO 14644-1) | US Federal Standard (FS 209E) | Appropriate applications in industry |
|---|---|---|
| ISO Class 3 | Class 1 | Advanced semiconductor and nanotechnology industries. |
| ISO Class 4 | Class 10 | The production of microchips, laser aerosols, and high-resolution displays. |
| ISO Class 5 | Class 100 | Sterile drug packaging line, biopharmaceutical extraction, microbial culture research lab. |
| ISO Class 6 | Class 1,000 | Manufacturing of advanced optical lenses and assembly of critical components for medical devices. |
| ISO Class 7 | Class 10,000 | Pharmaceutical/roll-on drug manufacturing plant, medical-grade cosmetics, supplement packaging line. |
| ISO Class 8 | Class 100,000 | GMP-certified food and beverage production plant, raw material preparation room, changing area. |
What level of cleanroom requirements does your industry need?
Selecting the appropriate Clean Room Class for your business type requires consideration of legal requirements, product quality standards, and contamination risks. The main industry groups can be categorized as follows:
1. ISO Class 5 (Class 100) for high-precision work and laboratory applications.
This is a very strict cleanroom environment, suitable for industries where even the smallest contaminants can damage products, such as:
- Pharmaceutical and Biologics Industry: Operational area for sterile injectable filling or sterile drug compounding according to PIC/S GMP grade A/B standards.
- Electronics Industry: Semiconductor manufacturing, high-frequency circuit boards, and hard disk read/write heads.
2. ISO Class 7 & 8 (Class 10,000 – 100,000) for the pharmaceutical, food, and cosmetic industries.
This is a popular class of air quality control product commonly found in Thailand's manufacturing sector. It is designed to control mold, bacteria, and general dust particles.
- Pharmaceutical and Supplement Manufacturing Plant (ISO Class 7): Area for mixing pharmaceutical ingredients, tablets, capsules, and packaging lines for products that are in direct contact with air.
- Food and beverage production factory (ISO Class 8 / GMP): Clean food packaging room (Aseptic Packaging Room), beverage production zone. and cosmetic packaging line To extend shelf life (Shelf Life)
- Medical Device Industry: Assembly and packaging zone for sterilized medical device kits.
In-depth analysis of key elements in maintaining Clean Room Class standards.
Maintaining a cleanroom's class to the designed standard at all times is not just about air filtration, but also about comprehensive building engineering system management.
1. Selecting the appropriate thermal insulation panel (Sandwich Panel).
The partition walls and ceilings must be prefabricated insulation panels (sandwich panels) with a smooth, glossy surface, free from pores and dust accumulation. PIR (Polyisocyanurate) core insulation is the most popular type used in food and pharmaceutical cleanrooms due to its heat resistance, fire protection, and resistance to cleaning with strong disinfectants.
2. Calculating the Air Change Rate (ACH)
Each Clean Room Class specifies a different rate of air circulation through the HEPA filter. The higher the class, the more frequently the air needs to be circulated and filtered. For example:
- ISO Class 8: Air circulation rate approximately 10–25 times/hour.
- ISO Class 7: Air circulation rate approximately 30–60 times/hour.
- ISO Class 5: Air circulation rate up to 240 – 480 times/hour (or using laminar flow)
3. Door and clean air blowing system (Air Shower & Interlock Door)
To prevent dust and contaminants from entering the cleanroom, an automatic interlocking door system (opening only one side at a time) must be installed in front of the cleanroom, along with an air shower to remove dust particles from employees' work clothing before entering the production zone.
Conclusion
Choosing the right Clean Room Class is not just about meeting legal standards, but also about planning for long-term financial viability and productivity. Project owners should consult engineers and cleanroom system experts from the planning stage to design the most accurate class for their industry.
Bliss Construction We are a construction and design company specializing in the installation of clean rooms and comprehensive industrial building engineering systems. With a team of expert engineers, we are ready to provide consultation and design clean rooms according to ISO 14644-1 and Thai FDA/GMP standards. We select premium materials, deliver projects on time, and never abandon a project.
Design cleanrooms that meet class requirements, are budget-friendly, and meet international standards. Contact Bliss Construction today for a free project consultation and cost estimate!
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