Damper actuators are devices used to control the opening and closing of dampers in HVAC and industrial systems, regulating the flow of air or other gases. Depending on the application and operational requirements, they can be powered by electricity, pneumatics, or hydraulics.
A "squirrel cage" fan, also known as a centrifugal fan, is a type of fan characterized by its cylindrical design with fan blades arranged around a central shaft, resembling a squirrel or hamster wheel. They are common in HVAC applications thanks to their ability to move large volumes of air efficiently and quietly.