A ducting air flow switch is a device used to measure and control the air flow in a ducting system. It is typically used in air conditioning systems, ventilation systems, and industrial processes. The switch is typically installed in the ducting system, and is used to measure the air flow rate and to control the air flow. The switch works by measuring the pressure difference between two points in the ducting system. When the pressure difference reaches a certain level, the switch is triggered and the air flow is adjusted accordingly. The switch can be used to regulate the air flow rate in order to maintain a comfortable temperature in the space, or to ensure that the air flow is not too high or too low. The switch can also be used to prevent the air flow from becoming too turbulent, which can cause problems with the air conditioning system.