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Yes, I have studied a lot of fluid dynamics. My question was because I don't understand your answer. If the inflow is higher than the outflow, you have more air in the room and therefore there is a positive differential. At least as I understand it.

Could you elaborate on the answer, please? Thank you in advance.

My apologies, I am not a native english speaker. Yes, the final intention for controlling pressure values is to control airflow.

Hello to all, I am a mechanical engineer entering the HVAC world and have stroke upon a case that neither my colleagues nor I can give a clear answer to. We are designing a building that is compounded by zones with different depressure levels, the building is surrounded by air at atmospheric...