A clean room (also called cleanroom) is a controlled environment designed to maintain low levels of contamination by particulate matter, microorganisms, chemical vapors and other pollutants.
These rooms are essential in industries where even the slightest contamination can compromise the quality, functionality or safety of products and processes.
Table of Contents
Definition of Clean Room
A cleanroom is a space specially constructed and maintained to control the concentration of airborne particulates, in addition to other critical environmental parameters, such as temperature, humidity and differential pressure. Its design integrates advanced air filtration systems, precise environmental controls and operating protocols to minimize the introduction, generation and retention of contaminants.
Cleanroom Application Sectors
Clean rooms have applications in a variety of industrial sectors, including:
- Pharmaceutical: Drug production, clinical research, vaccine production…
- Biotechnology: Tissue culture, genetic development, biological research…
- Medical devices: Assembly of surgical devices, manufacturing of implants…
- Microelectronics: semiconductor production, assembly of integrated circuits…
- Aerospace: Manufacture of optical components, satellite assembly…
- Food: Processing of sensitive foods, production of nutritional supplements…
- Hospital: Operating rooms, mysteriums, intensive care units…
Main components of a Clean Room
A cleanroom is composed of essential elements that ensure the environmental control necessary for your applications. Among the main components are:
- Architecture (walls, ceilings and floors):
Internal surfaces require non-porous, easy to clean and chemical resistant materials. In many cases, modular sandwich panel systems with smooth finishes and rounded corners are used to prevent particle buildup. Ceilings often incorporate filtration systems and may be designed to support suspended equipment. Floors should be continuous, non-slip and resistant to chemical agents, in addition to facilitating cleaning and the elimination of electrostatic charges. - HVAC (heating, ventilation and air conditioning) systems:
HVAC systems are configured to provide a constant flow of clean air, tailored to the requirements of the room. The air passes through HEPA or ULPA filters, which remove suspended particles before being distributed through ductwork. These systems also control parameters such as temperature, humidity and differential pressure, renewing the air between 20 and more than 600 times per hour, depending on the room classification. - Environmental control mechanisms:
Automated systems include sensors to measure and regulate critical parameters such as temperature, humidity and differential pressure. These mechanisms ensure the stability of the internal environment and make real-time adjustments to maintain optimal conditions. - Monitoring systems:
Cleanrooms integrate advanced continuous monitoring systems that record data on airborne particulates and other critical parameters. In addition, they can include access control and monitoring of critical operations to maintain environmental quality, record room activity, improve safety, and comply with regulatory standards.
How does a Clean Room work?
Cleanroom operation is based on precise control of air quality, environmental parameters and operating procedures, creating a stable and safe environment.
The process begins with the supply of HEPA or ULPA filtered air through ductwork. This clean air is distributed within the room, maintaining the necessary conditions to minimize the presence of particles and contaminants. Depending on the room design, the air flow can be unidirectional (laminar) or non-unidirectional (turbulent), ensuring an efficient distribution according to the needs of the process.
Differential pressure is another critical factor. It can be positive, to prevent contaminants from entering critical areas, or negative, to contain contaminants in specific areas, such as in biosafety applications.
Access to personnel and materials is managed by SAS Pass-boxes and interlocked doors that prevent the transfer of particles between areas.
In addition, personnel wear specialized clothing such as coveralls, gloves and masks to minimize the generation of particles inside the room.
Continuous monitoring systems monitor parameters such as temperature, humidity and pressure, generating alerts in case of deviations and allowing automatic or manual adjustments.
This level of control ensures that room conditions consistently meet established standards.
How is a Clean Room Designed and Built?
The design and construction of a cleanroom is a thorough process that must comply with regulatory standards and specific customer requirements. In general terms, the process includes:
- Definition of requirements: Cleanliness levels, processes to be performed and applicable regulatory standards are established.
- Selection of materials: The materials used should be resistant, easy to clean, compatible with disinfecting agents and designed to minimize the accumulation of particles.
- HVAC system design: Air flows, renewal cycles and filtration systems are configured to ensure uniform distribution of clean air and differential pressure control.
- Integration of systems and equipment: Monitoring systems, lighting and specific equipment, such as laminar flow cabinets, isolators or SAS Pass-boxes, are installed, adapted to the client’s needs.
- Validation and certification: Once built, the room is thoroughly tested to verify that it meets the required specifications and standards.
Clean Room Regulations
Clean rooms are regulated by international standards that establish criteria for their design, operation and maintenance. There are a multitude of regulations to be taken into account, among the most relevant are:
- ISO 14644: Establishes classification requirements for cleanrooms according to the maximum concentration of particles allowed in the air.
- GMP (Good Manufacturing Practices): Provides specific guidelines for the manufacture of pharmaceutical and biotechnological products, ensuring quality and safety.
Cleanroom Classification
Cleanrooms are classified according to the maximum concentration of particles allowed in the air. According to ISO 14644, they are categorized from Class 1 (the most stringent) to Class 9. In GMP, the categories range from Grade A to D.
