What Are The Requirements for The Layout Quantity of FFU Fan Filter Unit in Class 100, Class 1000 And Class 10000 Clean Rooms

Clean Rooms are now an important part of the infrastructure in contemporary industrial and laboratory settings, contributing to the establishment of both product quality and safe production. It is specifically true in the pharmaceuticals, cosmetics, and food processing as well as within semiconductor industries because air cleanliness has direct relevance to product quality and safety. Being the fundamental gear in Clean Room air purification, the placement, number, and design of Fan Filter Units are pivotal to the general output of a Clean Room. This article will examine the layout requirements of FFUs for Clean Rooms, including the nature of Class 100, Class 1000, and Class 10000 Clean Rooms and professional Clean Room Design concepts.

Class 100 Clean Room FFU Layout Requirements

Class 100 Clean Rooms have very high air cleanliness standards, and the acceptable suspended particle count per cubic meter (0.5 μm) is restricted to 3520. With this level of purity, the configuration of FFUs to Clean Rooms warrants uniform coverage and a constant airflow.

• Layout Principle: Utilize a vertical, unidirectional airflow design, with air drawn in evenly from the ceiling and flowing downward to floor-level exhaust vents.

• FFU spacing: 0.9–1.2 meters is generally recommended to ensure uniform airflow throughout the clean room area.

• Air Velocity Control: FFU air velocity is generally maintained at 0.36–0.45 m/s to ensure air cleanliness and stable airflow.

• Design Key Point: In a Class 100 Clean Room, FFU coverage must be carefully considered for every corner and critical production area to prevent localized turbulence that could impact product quality.

Class 1000 Clean Room FFU Layout Requirements

Class 1000 Clean Rooms have relatively relaxed air cleanliness requirements, with the number of suspended particles per cubic meter (0.5 μm) not exceeding 352000.

• Layout Principles: A unidirectional or mixed flow design can be used, with localized FFU coverage in key production areas.

• FFU Spacing: Typically, 1.2–1.5 meters is sufficient, ensuring cleanliness while helping to reduce equipment count and energy consumption.

• Air Velocity Control: FFU air velocity is generally between 0.30–0.45 m/s.

• Design Key Points: Class 1000 Clean Rooms allow for some air turbulence, but localized FFUs may still be required above production equipment or workstations to ensure air cleanliness and particulate matter control.

FFU Layout Requirements for Class 10000 Clean Rooms

Class 10000 Clean Rooms require an air cleanliness level of ≤ 3520000 suspended particles (0.5 μm) per cubic meter of air. A mixed flow design is recommended.

• Layout Principle: Utilize a mixed flow pattern, with air drawn in by FFUs or AHUs and returned through exhaust vents. FFUs are locally added to key production areas.

• FFU spacing: 1.5–2.0 meters is recommended, with air speeds controlled between 0.25–0.35 m/s.

• Key Design Points: Class 10000 Clean Rooms require less uniform airflow, but FFU coverage is still necessary in key operating areas to ensure smooth production processes.

FFU Quantity Calculation Reference

In Clean Room Design, the following formula can be used to determine the number of FFUs:

• Number of FFUs ≈ Purification Area / Effective Air Supply Area of a Single FFU × Safety Factor

• Purification Area: Actual area of the clean room (m²)

• Effective Air Supply Area of a Single FFU: Typically 0.6 × 0.6 m² or 0.9 × 0.9 m²

• Safety Factor: Adjusted based on clean room cleanliness level: 1.1–1.2 for Class 100, 1.05–1.1 for Class 1000, and 1.0–1.05 for Class 10000

During actual design, factors such as floor height, ceiling layout, equipment placement, and exhaust location should also be considered to ensure optimal purification performance of the FFU Fan Filter Unit.

Layout Design Considerations

• Coverage of Critical Areas: Adequate FFU coverage is required above operating tables and production equipment to prevent particle accumulation.

• Airflow Uniformity: Properly control FFU spacing and air velocity to avoid dead spots and turbulent areas.

• Energy Savings and Cost Balancing: Select the number of FFUs based on the cleanliness level to avoid over-configuration.

• Flexibility: The modular layout facilitates future expansion and modification to adapt to changing production needs.

Summary

The design of clean rooms involve the arrangement and quantity of FFUs, depending on the level of clean room, erring on the clean side of the scale, the difference being in clean room Class 100, Class 1000, and Class 10000. Clean Rooms, nevertheless, the essential premise of the plan remains constant: the assurance of clean air, consistency of air velocity, and provision of stable airflow in high points of vulnerability.

• Class 100 Clean Rooms: a dense arrangement, high velocity of air, and extensive coverage.

• Class 1000 Clean Rooms: moderate design: intense coverage in critical areas.

• Class 10000 Clean Rooms: loose design, with improvements on critical spots where needed.

Economic FFU Fan Filter Unit design does not only suit cleanliness demands but also enhances production rate, wastes less energy, and saves maintenance expenses. The layout requirements of the FFU are an essential step in the realization of efficient, safe, and compliant production of project planners of the Clean Room.