Hello, I am trying to cool down an electronics cabinet using air at various conditions (Temperature). The cabinet contains components on the inside and each has an inlet and an outlet. The outlet is a circle hole or "orifice". I need to determine the size of the orifice to achieve an outlet uniform temperature of 140°F. How do I go about determining the orifice size? (The air is entering at 70°F and the component is producing heat due to electronics) Thanks for your help.