Backdraft dampers: Installed to allow just one-way airflow, these kinds include shafts on one finish of every blade to circumvent air from flowing again in the opposite path. If needed, a counterbalance can guide. Handbook dampers are adjusted by hand and are usually Employed in more mature HVAC systems. They https://ricardokaqdr.blog-a-story.com/17752606/not-known-facts-about-air-control-dampers-for-hot-climates