ID, FD, PA, SA Fans And Their Applications
The most important of these fans are The ID (Induced Draft) fans, the FD (Forced Draft) fans, the PA (Primary Air) fans, and the SA (Secondary Air) fans. We shall now have a brief look at the various applications of these fans (also called as blowers) in the industries. The ID fans take in the flue gases having high levels of heat from furnaces ...