Backdraft dampers: Put in to allow just one-way airflow, these styles include shafts on one particular conclude of each blade to prevent air from flowing again in the other direction. If necessary, a counterbalance can aid. Smoke dampers are just like fire dampers but are specially intended to control the https://thermaltransferlabelprint81233.blogitright.com/36784341/top-latest-five-air-control-dampers-for-engine-sheds-urban-news