The Architect 2. The General Contractor 3. The Heating, Ventilating and Air Conditioning Contractor 4. The Electrician 5. The Roofer 6.
Air flow reduces heat and is easily explained, using a catsup bottle as an example.
In order for the catsup to exit the bottle, air must enter the bottle. The same is true for your attic. In order for excessive heat to exit the attic, inlet or make-up air must be able to enter the attic. You must have both, inlet and outlet vents and in a balanced proportion, too. The following are pictorial examples of some ways excessive heat enters the attic space and some reasons why that unwanted heat can not exit that attic space, the ultimate enemy of a healthy home.