Blade dampers develop much less noise and are available in two varieties: parallel and opposed dampers. Parallel blade dampers: Their blades shift in precisely the same route and manage the airflow. Guide dampers, On the flip side, are adjusted by hand. This lets you customise the airflow in your program https://air-control-dampers-for-h46788.oblogation.com/35740178/the-greatest-guide-to-air-control-dampers-for-engine-sheds