I am trying to develop a basic model for calculating internal room pressure. I am using the vent opening equation. q = Cd A ((2 *delta P )/p)^0.5
If I have a set the vent 2500 mm2; A = 2.5e-3 m^2
Cd = 0.61
Internal pressure to be 102,135 and the external pressure to be 102,140;
p = 1.21205...