Negative pressure room
 

Dear friends

I am working on the negative pressure room. However, it does not work well. The outlet release the air volume 600 cfm while the supply air is 450 cfm. The room is 3*3*2.5 m. I set the inlet and outlet by mass flow rate. I found that the pressure in the room is -0.101 pa but my targer is -2.5 pa (meausred at actual room).

Do you have any suggest ?

Considering that you are specifying flow rates in cubic feet per minute and room dimensions in meters, I would look for a unit conversion error somewhere first.