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https://www.alphainstruments.com/critical-environments/

Critical Environments are spaces within a building where highly controlled processes take place. These are typically room conditions where safety of personnel and the protection of assets is essential. The room pressure for critical environments is crucial.
One of the most important decision that mechanical designers, engineers, and architects can make is the selection of a low-differential pressure transducer for critical-care ventilation. It can be used as a room differential pressure sensor and environmental chamber condition monitor.