Functional changes can be made while processing pharmaceuticals, according to an article on the Healthcare Packaging website.
Upgrades during a shutdown pose less risk, but there are instances when a facility must expand capacity while maintaining some processing.
It is critical to maintain control of production while keeping the involved workers and the products safe.
A company will need to revalidate any system modified during a facility change, and the extent of the change may also require a re-inspection by the FDA.
Ventilation and Filtering for Infection Control 
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