Backdraft dampers: Set up to allow one-way airflow, these types incorporate shafts on one particular conclude of every blade to prevent air from flowing again in the alternative route. If necessary, a counterbalance can aid. Handbook dampers are adjusted by hand and are generally Utilized in more mature HVAC techniques. https://air-control-dampers-for-e67899.liberty-blog.com/36862626/not-known-facts-about-air-control-dampers-for-hot-climates