Qualification
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Validation is an extensive exercise
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Qualification of the HVAC system is one component in the overall approach that covers premises, systems/utilities, equipment, processes, etc.
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See also full guidelines on "Validation" in WHO TRS No 937, 2005, Annex 4.
Risk-based approach for HVAC qualification
8.2 Qualification
8.2.1 Validation is a many-faceted and extensive activity and is beyond the scope of these guidelines. Qualification and validation guidelines are included in: Expert Committee on Specifications for Pharmaceutical Preparations.
Fortieth report. Geneva, World Health Organization, 2005 (WHO Technical Report Series, No. 937), Annex 4 (see also Fig. 28).