5 x 15M 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

FFU System
FFU (Fan Filter Unit) is the core component of the clean room, FFU is responsible for air intake and initial filtration through the primary filter, and then through the high-efficiency filter for deeper filtration, in order to remove particles in the air. The filtered clean air is uniformly sent out to the clean room at a certain wind speed, forming a vertical unidirectional flow to ensure the cleanliness of the work area.
Structural design
The structural design of the clean room is usually assembled, which is easy to install and disassemble, and also easy for future maintenance and upgrading. The clean room is usually surrounded by anti-static curtains or isolation facilities made of dust-proof materials to isolate the air flow between the interior and the exterior and to maintain a clean environment inside.
Cleanliness Standards
The cleanliness of a cleanroom is usually measured in terms of particle counts per cubic meter (PCM) or per cubic foot (PCF). Different industries and applications will have different cleanliness standards. For example, pharmaceutical manufacturing may follow GMP (Good Manufacturing Practice) standards, while food processing may have specific microbiological control standards.

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Cleanrooms Installation

Prepare installation tools: Before installation, make sure all the necessary tools and materials are complete, including screwdrivers, leveling tape, and so on.
Installation frame: Two people climb up to the ceiling, lay the metal foot keel and hand-supported lifting trusses, while the other two people put the FFU on the table and prepare the high-efficiency filter.
Fixed aluminum ladder: two people are needed to assist in fixing the aluminum ladder and lifting the fan unit to the ceiling to ensure horizontal placement.
Tilt mounting the FFU: Tilt the FFU to the ceiling and catch it by the person above.
Handling the FFU: In the clean room, two people holding the HEPA filter hand it over to the staff for installation.
Installing the filter: Install the filter diagonally towards the keel, taking care to protect the HEPA filter as it is fragile and critical.
Install the HEPA filter horizontally: Make sure the filter is effectively combined with the keel.
Installation of Fans: Put down the FFU, install the fans close to the high-efficiency filter, take care not to damage the filter, and check whether the FFU is pressed tightly.
Inspection and debugging: Check after the installation is completed to ensure that all components operate normally and achieve the expected clean effect.

Cleanrooms Testing

Dust Particle Count Test

Purpose of Testing
Particle count testing is a key part of ensuring that the performance of a clean room is up to standard. Through the test, we can determine whether the clean room has reached the expected cleanliness level, so as to ensure the aseptic environment and product quality in the production process.
Testing Standards
According to ISO 14644-1, the suspended particle count inside the clean room should be controlled within a certain range from static to dynamic. The maximum permissible number of particles is 3500 particles/m³ in static mode and 7500 particles/m³ in dynamic mode.1
Detection method
Detection is carried out using a laser dust particle counter, which is capable of monitoring and counting the number of particles in different size ranges in real time. When testing, it is necessary to set up a reasonable sampling point in the clean room, usually in the production workshop, the sampling point can be set in the column or wall at a height of about 2.5 meters; if there are sanding machines and other equipment, the sampling point can be set in the equipment above the 0.5-2 meters.

Wind Speed Test

Purpose of testing
The purpose of wind speed testing is to ensure that the air flow in the clean room meets the requirements, and to determine whether the air purification equipment is operating normally and whether its configuration is reasonable.
Testing standard
The wind speed inside the clean room should be controlled between 0.2-0.5m/s, which is conducive to maintaining the cleanliness inside the clean room.
Test Method
Use professional anemometer to measure, make sure the sensor of anemometer is correctly placed, and record the readings of each position, so as to judge whether the wind speed is uniform and within the standard range.

Ventilation test

Detection purpose
The number of air changes reflects the freshness of the air inside the clean room and the load on the purification equipment. Appropriate number of air changes is essential to maintain a stable environment inside the clean room.
Testing standard
In general, the number of air changes should be controlled at 3-5 times per hour, which helps to continuously renew the air inside the clean room and reduce the accumulation of pollutants.
Testing Methods
By monitoring the operation of the equipment and calculating the number of air changes, it is possible to assess whether the air circulation in the clean room is reasonable.