AIR DISTRIBUTION IN CLEAN ROOMS

The selection of the airflow concept for a clean room depends on the following:

  • The air cleanliness class
  • The process
  • The spatial requirements

DIFFERENT PROCESSES REQUIRE DIFFERENT FLOW CONCEPTS

Discharge pattern, Mode of action and The effectiveness of a clean room concept depends on the construction of the air inlets and outlets, as well as their combination and spatial arrangement.

In the occupied zone the ideal air distribution can be achieved with high induction levels that lead to a rapid reduction of airflow velocities and of the temperature differences between room air and supply air.

If the goal is a laminar flow, the airflow velocity and a constant airflow must be maintained.

AIR DISTRIBUTION STRATEGIES FOR CLEAN ROOMS

LOW-TURBULENCE LAMINAR FLOW (LF)

Low-turbulence laminar flow (LF) is characterised by an evenvelocity profile and almost parallel flow lines across the entire cross selection of the clean area. With LF, maximum air cleanliness classes can be achieved – even in large clean air areas.

Low-turbulence laminar flow is used where products and processes are particularly sensitive and need to be protected from contamination. Here, the recirculation and/or exhaust air is extracted close to the ground.

LOW-TURBULENCE LAMINAR FLOW (LF) FOR MICROELECTRONIC PROCESSES

A special feature of microelectronics is that the recirculation and/or exhaust air is extracted via a raised floor so as not to influencethe laminar flow near the ground.


TURBULENT FLOW

Turbulent flow means that the primary air mixes with the induced room air. Clean air is not supplied across the entire room but only at selected points, typically through ceiling swirl diffusers. The high induction causes good mixing of the room air and flooding of the clean air area.

The turbulence flow combines final HEPA filters with a swirl diffuser. The recirculation and/or exhaust air is usually extracted close to the ground.

DIRECTIONAL FLOW

Directional flow is particularly suitable for separating clean areas from impure or less clean areas. The Here, the discharge pattern runs across the room from one side to the other.. This can be across the wall surface across the room or from one side up to the other side down.

Directional flow is used where a transfer of particles from one area to another area is to be prevented. Ideal for airlocks between two cleanliness zones.

OPTIMISED FOR YOUR CLEAN ROOM

We offer concepts for every clean room, individually adapted to your processes.

Our tailor-made solutions meet all norms and standards up to the highest hygienic requirements:

  • Hygiene requirements of VDI 6022
  • For air cleanliness classes according to ISO 14644-1, GMP or Federal Standard 209e

In the process, TROX final Particulate filter air terminal devices provide the necessary air cleanliness. 

YOUR PERSONAL ADVISOR

I AM HAPPY TO ADVISE YOU.     

Whether new construction, design, optimisation, system expansion, refurbishment or maintenance – TROX is at your side. Describe your specific needs to us or arrange a non-binding consultation.

Patric Unterdorfer

Global Key Client Manager Pharma & Food

Phone: +49 (0) 2845 202 1128

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