How to Maintain Validated State in HVAC Systems: Recertification Plans, Frequency & Risk-Based Revalidation Maintaining the Validated State of HVAC Systems in Pharma: Recertification, Frequency, and Risk-Based Revalidation In pharmaceutical manufacturing, HVAC systems play a critical role in ensuring product quality, contamination control, and compliance with global regulatory expectations. However, initial qualification alone is insufficient. HVAC systems must be maintained in a validated state through systematic recertification, risk-based revalidation, and ongoing performance monitoring throughout the equipment lifecycle. This article provides a comprehensive guide on how to maintain the validated state of HVAC systems in compliance with EU GMP Annex 1,…