Roof plan of pressurisation fan details of hospital building is given in the autocad DWG drawing file. Steel plate, air flow switch, smoke detector, welding and bolt are mentioned here. A flow switch is a device that monitors the flow of air, steam or liquid. It sends a "trip signal" to a different device in the system, such as a pump. Some of the general uses are for pump protection, for cooling-circuit protection and alarms for too high or too low flow rates. Thank you for downloading the Autocad DWG drawing file and other CAD program files from our cadbull website.