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Cleanroom Airlocks, Cleanroom contamination control.

Cleanroom (Airlocks) Air Pressure Balancing


Introduction: -

HVAC air pressure balancing is an important part of cleanroom HVAC. Balancing the air pressure in a cleanroom ensures that the product manufacturing in one area of the cleanroom does not contaminate products in another area. Pressure balancing prevents cross-contamination of products processed in the cleanroom.

Airflow patterns or direction in a cleanroom are entirely dependent on the cleanroom air pressure balancing.


Air pressure balancing (Airlocks) in cleanroom maintained in three types.

  • Cascade Airlock
  • Sink Airlock
  • Bubble Airlock




Cascade Airlock Flow: -

In the cascade airlock Air flows from higher pressure zone to lower pressure zone in one direction.
Cascade airlock having Higher pressure zone on its one side and lower pressure zone on other side.

Sink Airlock Flow: -

Sink airlock having a positive pressure zone at both sides of airlock and having negative pressure inside the airlock.
In this type of airlock air is flow inside the airlock from both sides of airlock. 

Bubble Airlock Flow:-

Bubble airlock having lower pressure zone at both sides of airlock and having positive pressure inside the airlock. 

In this type of airlock air flows from airlock to both sides of airlocks in clean room.




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