5 x 12M 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 Flow Methods
There are two main types of air flow in the clean room: vertical flow and horizontal flow. Vertical flow refers to the air flow from top to bottom, this way can effectively reduce the particles in the working area of the residence time, improve the cleanliness. Horizontal flow is the parallel flow of air in the working area, which is conducive to maintaining a constant level of cleanliness in the working area.
Ventilation system and filters
Clean rooms are equipped with efficient ventilation systems to maintain air flow and reduce airborne particles and other contaminants. The ventilation system also includes exhaust equipment and devices for introducing fresh filtered air. In addition, the clean room is equipped with high efficiency air filters such as HEPA (High Efficiency Particulate Air) or ULPA (Ultra High Efficiency Particulate Air) filters to capture and remove small particles, ensuring that airborne particulate matter is maintained at an acceptably low level.
Air Quality Control
Clean rooms are usually constructed with negative or positive pressure systems to prevent the entry of unclean air from the outside or the escape of clean air from the inside in order to maintain a clean environment inside.
Clean Clothing
Operators working in a clean room are usually required to wear special clean suits including helmets, face masks, gloves and clothing to minimize contamination from the human body.

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Cleanrooms Installation

Environment Preparation
Before installing a clean room, the environment needs to be thoroughly cleaned and sanitized to ensure basic cleanliness conditions. At the same time, make sure that the construction area has enough space to accommodate the clean room and related equipment.
Frame Construction
According to the size and design requirements of the clean room, use suitable materials (e.g. aluminum alloy profiles) to build the frame and make sure it is stable and reliable. If necessary, add support points in the center to ensure personnel safety.
Filtration System Installation
Choose the right type and specification of filter, install it on the top or side of the clean room, and use sealing materials to ensure that there is no air leakage. Filters are critical to the cleanliness of the interior of the cleanroom.
Sealing Material Application
Install sealing materials, such as sealing strips and gaskets, around the perimeter of the clean room and at openings such as doors and windows to ensure a good seal.
Lighting and Ventilation
According to the usage requirements of the clean room, install appropriate lighting and ventilation equipment, such as exhaust fans, air conditioners, etc., to regulate the temperature and humidity inside the clean room.
Inspection and commissioning
After completing the installation, use professional testing instruments to test the air quality in the clean room to ensure that the cleanliness, temperature, humidity and other parameters meet the requirements. The ventilation system and lighting system are debugged to ensure smooth air circulation, even airflow and good lighting effect.

Cleanrooms Testing

Temperature and Humidity
The temperature and humidity inside the clean room needs to be strictly controlled to suit different production and testing needs. When testing, it is necessary to ensure that the temperature and humidity sensors are accurate and that data logging is complete.
Airborne Suspended Particulates
Suspended particles in the air are one of the main focuses of clean room testing. Laser particle counters or other specialized equipment are often used when testing suspended particle counts to ensure that the air in the cleanroom meets predetermined cleanliness standards.
Fresh Air Volume
Fresh air volume testing is to ensure that there is an adequate supply of fresh air in the clean room, which is extremely important for the health of personnel and work efficiency. Fresh air volume is usually checked by means of an air volume hood and an anemometer.
Differential Pressure
Differential pressure testing is done to ensure that there is a difference in air pressure between the inside and outside of the clean room to prevent the intrusion of outside contaminants. Differential pressure checks are usually carried out using a differential pressure meter.
Airflow status
The airflow condition test is to ensure that the air flow meets the design requirements and to prevent cross contamination. During the inspection, equipment such as smoke machines may be used to observe the airflow path.
Inspection Criteria
Testing standards for clean rooms usually follow GB/T 25915.3-2024 and other relevant national standards, which specify the testing methods and technical requirements in detail.