Backdraft dampers: Set up to permit one-way airflow, these kinds incorporate shafts on 1 finish of each blade to stop air from flowing back in the opposite direction. If vital, a counterbalance can support. HVAC dampers are special equipment inside your ductwork. They control air stream in your house. By https://air-control-dampers-for-e78900.estate-blog.com/35709139/detailed-notes-on-air-control-dampers-for-hot-climates