I am trying to calculate how to maintain a .05" positive pressure in a room. I know the supply volumetric flow but I am trying to size the return based on the goal of .05" positive pressure. There are 2 doors in the room both with a space under the bottom of the door. (each crack 0.5"x3') I know that the volumetric flow in and out will not be balanced (more in than out) to maintain a positive pressure in the room. So I guess my question: Given the nature of this problem, what rule of thumb, model, or equation could I use to figure this out? What is the room pressure with just the cracks? How do I find the room pressure with the cracks and return of size X? I appreciate your responses.
room dimensions 22'x22'x10' supply air 2360cfm crack surface area (for both) 3ft^2 return size X?
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