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Three Common Cleanroom Airflow Types

In cleanroom design and operation, airflow pattern is one of the core elements. Proper airflow patterns not only effectively control particle dispersion and microbial concentration, but also ensure product quality and personnel safety. Different processes and industries require different cleanroom airflow types. These are generally classified into three main types – laminar airflow, turbulent airflow, and combined airflow – each with its own applications and distinct characteristics.

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Laminar Airflow (Unidirectional Airflow)

Air is typically supplied into the room through High efficiency particulate air filters (HEPA/ULPA) at a uniform velocity (0.3–0.5 m/s), flowing in a single direction to create a 'piston effect' that rapidly removes contaminants.

Features
  • High cleanliness: Achieves ISO Class 1–5 standards
  • Stable airflow velocity: Typically 0.3–0.5 m/s
  • High energy consumption: Requires a large air volume to maintain stable airflow
  • Layout constraints: Arrangement must avoid disturbing airflow direction.
Applications
  • Operating room
  • Semiconductor wafer production
  • Aseptic injection filling lines
  • Precision aerospace component assembly
Horizontal laminar airflow cleanroom schematic diagram

Horizontal

Vertical laminar airflow cleanroom schematic diagram

Vertical

Turbulent Airflow (Non-Unidirectional Airflow)

Air moves in multiple directions and random patterns, creating irregular turbulent airflow. This mixes and dilutes airborne particle concentrations before they are ultimately exhausted through vents or return ducts.

Features
  • Low air change rate: Typically 20–100 ACH
  • Low cleanliness levels: Generally suitable for ISO Class 6–9.
  • Low cost: Less stringent construction requirements and lower energy consumption.
Applications
  • General electronics manufacturing workshops
  • Food and cosmetics production areas
  • Lower-grade pharmaceutical cleanrooms
Turbulent airflow cleanroom schematic diagram

Turbulent airflow

Radial airflow cleanroom schematic diagram

Radial airflow

Combined Airflow

Combining the characteristics of unidirectional and non-unidirectional airflow, unidirectional airflow is used in critical areas, while non-unidirectional airflow is applied in other zones.

Features
  • Balances performance and cost
  • Requires precise airflow design
Applications
  • Electronic component assembly areas
  • Medical device manufacturing
Combined airflow cleanroom schematic diagram

Laminar airflow + turbulent airflow

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