Backdraft dampers: Installed to permit a person-way airflow, these kinds incorporate shafts on one particular conclusion of every blade to circumvent air from flowing back in the other way. If necessary, a counterbalance can guide. Manual dampers are modified by hand and are generally Employed in older HVAC programs. They https://air-control-dampers-for-e13455.blog-gold.com/48419822/about-air-control-dampers-for-hot-climates