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In the pharmaceutICal and precision manufacturing industries, cleanroom environmental standards are critical for product quality control. This report details the particulate and microbial control standards for Class 300,000 clean areas, as well as the facility requirements that comply with GMP (Good Manufacturing Practice). Cleanroom design follows strict environmental control standards to ensure that contaminants during the production process are controlled within acceptable limits.
Air Cleanliness
Strict control of particulate quantity and size distribution in the air to ensure compliance with ISO standards.
Microbial Control
Rigorous monitoring of floating and settled bacteria to ensure biological contaminants remain within safe limits.
Pressure Control
Maintain cleanroom positive pressure >10Pa to prevent external contaminants from entering critical areas.
Class 300,000 Clean Area Standards
The following table details the maximum allowable levels of contaminants in Class 300,000 clean areas per cubic meter of air:
GMP compliance Requirements
Pressure Requirements
The external pressure of each room must meet GMP requirements for clean workshops, maintaining a minimum positive pressure differential of >10Pa. This pressure gradient ensures unidirectional airflow from cleaner to less clean areas, preventing cross-contamination.
Equipment & Installation
Confirmation: The equipment supplier and the construction/installation unit meet the construction and installation requirements of the gmp clean workshop. All materials, equipment, and installation procedures comply with GMP Standards for cleanroom environments.
Key GMP Requirements
Regular Environmental monitoring program
Material compatibility with cleanroom processes
Documented cleaning and sanitization procedures
Personnel training and gowning protocols
Preventive maintenance schedules
Change control procedures for modifications
Comprehensive documentation system
Particle Distribution Visualization
Particle Size Distribution
Microorganism Limits
Cleanroom Environmental Standards Report
Document ID: CR-ESR-300K-2023 | Revision: 1.0 | Date: July 15, 2025
faq(Frequently Asked Questions)
What does it mean for a cleanroom to be classified as 300,000-level?
A cleanroom classified as a clean area with a rating of 300,000 is a type of cleanliness in the Pharmaceutical industry that controls the amount of airborne particles and microorganisms in a space. It is mostly used for production that is not aseptic but still has a risk involved.
Particle Standards for the Class 300,000 clean area
The maximum amounts of particles for Class 300,000 clean areas are: Particles >= 0.5 μm: 10,500,000 particles/m³; Particles >= 5 μm: 60,000 particles/m³. Verify these limits against regulations, applicable standards of the project and the state of the room.
Is Class 300,000 compatible with iso 14644?
There is no direct equivalence between the two classes. But looking at the limit for particles that measure >= 0.5 μm, Class 300,000 does fall between iso classes 8 and 9 (the classification should not be based only on particle concentration, ISO practices are necessary in order to classify the class correctly).
What are the limits for microbes?
According to pharmaceutical practices it is generally accepted to attempt to achieve microbial concentration of 15 CFU/m³ for airborne microbes and 10 CFU per plate of settling-plates. The limitation of plate should be done according to GMP regulations and contamination management plan.
What are the humidity and temperature conditions?
The values most often mentioned are around 18 – 26°C and 45 – 65. The exact range must depend on the stability of the product, process conditions, comfort of the operator and condensation destruction.
What pressure difference is necessary?
The pressure that has to be maintained is usually about 5–15 Pa. The optimal value is determined by layout of the room, mode of door operating and etc.
