Blade dampers create a lot less sound and come in two sorts: parallel and opposed dampers. Parallel blade dampers: Their blades shift in the exact same way and manage the airflow. Handbook dampers are modified by hand and are generally Employed in older HVAC devices. They are much less common https://donovanyncqd.bloguetechno.com/top-guidelines-of-air-control-dampers-for-hot-climates-71613299