A goal method and a target method for balancing exhaust ventilation duct systems with dampers

The Goal and the target methods are discussed in this study , they are used for balancing exhaust ventilation duct systems with dampers. For each, a detailed step-by-step procedure is presented. For the goal method, the damper is adjusted in each branch until the airflow for each branch equals the goal airflow : it is time consuming and the overall resistance of the system increases, reducing the fan output. Concerning the target method, simulations predict a better accuracy for fewer adjustments than the goal method, but it is more computationally difficult.