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PHSS Clarity In GMP Guidance Note Cleanroom Airflow Definitions
PHSS Clarity in GMP Guidance Note- Cleanroom Airflow Definitions: Aligning Ui-Directional Airflow (UDAF), Localised Uni Directional airflow (L-UDAF) and Grade A Air Supply
Uni-directional airflow (UDAF) where airflow vectors move in the same direction from a HEPA filtered source is one of the main environmental airborne contamination control attributes in pharmaceutical manufacturing (together with pressure differentials between clean areas). UDAF in Pharmaceutical applications is sometimes referred to as LAF (Laminar airflow) where scientifically airflow vectors would be straight and parallel.
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Although straight and parallel airflow vectors are generated from the HEPA filtered source because air extract or exhaust points are typically at low level on the side or junction with floor of the clean air zone airflow vectors no longer continue to be straight and parallel (LAF) as they track towards exit points. In changing direction towards the exit air points the vectors should continue to follow a single (uni) directional path without adverse turbulence or reverse change of direction where air flow re-enters the source air from the HEPA filter referred to as ‘First air’.
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