5 x 18M class 7 hardwall Cleanroom

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Detail
Airflow
Installation
Testing

Cleanrooms Detail

1. Particle Count (Air Cleanliness):

The ISO 7 modular hardwall cleanroom standard defines the maximum number of particles allowed in the air based on particle sizes.

Particle Count Limits (for 1 cubic meter of air):

0.5 µm particles: Maximum of 352,000 particles/m³
1.0 µm particles: Maximum of 83,200 particles/m³
5.0 µm particles: Maximum of 3,520 particles/m³

These limits ensure that the cleanroom meets specific cleanliness levels to prevent contamination during manufacturing processes or experiments.

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2. Air Changes per Hour (ACH):

The number of air changes per hour in an ISO 7 modular hardwall cleanroom is typically 30 to 60 ACH. This means the air in the room is exchanged 30 to 60 times per hour to maintain cleanliness and remove airborne particles.

This high rate of air exchange helps keep the concentration of particles low and maintains uniform air pressure and temperature.

3. Airflow and Pressure Control:

Laminar Flow: To prevent cross-contamination, airflow in an ISO 7 modular hardwall cleanroom is often directed in a laminar flow pattern, which means the air moves in a smooth, uniform direction, typically from ceiling to floor, minimizing turbulence.

Positive Pressure: The room is typically maintained under positive pressure relative to surrounding areas. This means air flows into the cleanroom but not out, preventing contaminants from entering the room.

Directional Airflow: The air can be filtered using HEPA (High-Efficiency Particulate Air) filters to trap particles down to 0.3 microns or smaller, further ensuring that the room meets the required cleanliness.

4. Temperature and Humidity Control:

Temperature: The temperature in an ISO 7 modular cleanroom is typically maintained within a range of 18°C to 22°C (64°F to 72°F), though this can vary depending on the specific application or requirements of the processes being performed in the room.

Humidity: The humidity level is often controlled within a range of 30% to 60% RH (relative humidity). Some industries (e.g., pharmaceuticals, electronics) may have more stringent humidity requirements, especially to prevent electrostatic discharge (ESD) or product degradation.

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Cleanrooms Airflow

Air Filtration
The air filtration system in a clean room is the basis of its work. First, the air passes through a pre-filter for initial treatment to remove larger particles, and then it passes through a high-efficiency filter (HEPA) or an ultra-high-efficiency filter (ULPA) to further remove fine particles and ensure the cleanliness of the air. This process involves not only physical filtration, but also the control of air temperature and humidity, flow rate and other parameters to achieve the desired cleanliness.23
Positive Pressure Control
In order to prevent the intrusion of external contaminants, the inside of a clean room is usually kept under positive pressure, i.e. the internal air pressure is higher than the external environment. This is achieved by controlling the volume of air supply and return to ensure that the air inside the clean room is always at a positive pressure difference. Positive pressure control is critical to maintaining a stable environment inside the cleanroom, especially in environments where protection from external contaminants is required.

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Cleanrooms Installation

Construction Steps

Infrastructure Installation: According to the design requirements, install the infrastructure of the clean room, including walls, ceilings and floors, etc., and ensure its solidity and levelness.
Installation of filtration system: according to the requirements of clean level, select the appropriate filtration system, and carry out installation and debugging to ensure that the air purification effect is up to standard.
Installation of doors, windows and sealing materials: Install the doors and windows of the clean room, and use sealing materials to ensure the sealing performance of the clean room to prevent air leakage.
Lighting equipment installation: according to the lighting requirements of the clean room, select the appropriate lighting equipment, and install and debug to ensure good lighting effect.
Installation of internal equipment: according to the purpose of the clean room, install the workbench and other necessary equipment, and carry out debugging and testing to ensure that the equipment operates normally.

Precautions

Ensure that the construction personnel have the relevant knowledge and skills to operate and install the clean room correctly.
Choose a suitable installation location, avoiding areas that are dusty, humid or have other sources of contamination.
Clean and sanitize the clean room before and after installation, especially the internal surfaces, such as wall panels, ceilings and filters.
Regularly inspect and maintain the clean room, clean filters and discharge contaminants in a timely manner.

Cleanrooms Testing

Cleanliness Testing
Cleanliness is an important index to measure the cleanliness of the air in the clean room. When testing, specialized equipment such as laser dust particle counters are required to be used, and testing is conducted according to certain sampling points and sampling times. The test results should be in accordance with specific cleanliness level standards, such as ISO 14644 or US Federal Standard 209E.
Temperature and humidity testing
Temperature and humidity control in the clean room is also an important part of ensuring the quality of the working environment. When testing, equipment such as temperature and humidity meters or stick alcohol thermometers should be used, and testing should be conducted according to certain sampling points and sampling times. The test results should be in line with the requirements of the production process.
Air flow detection
The air flow in the clean room has an important influence on the cleanliness. When testing, anemometers and other equipment should be used to measure the air flow rate in the clean room to ensure uniform air flow and avoid the formation of eddy currents or stagnant airflow areas.
Air Filter Inspection
The air filter in the clean room is the key equipment to ensure cleanliness. When testing, the operational status of the filter should be checked, including the cleanliness of the filter, replacement cycle, replacement records, etc.
Sterilization test
For clean sheds that require disinfection treatment, disinfection effect testing should be carried out regularly to ensure the normal operation of disinfection facilities and the disinfection effect is up to standard.