The FGG Flowgrid is made of a galvanised duct section and incorporates the CMR Alumimium Flow Probes. The duct connections are standard sized flanges. The FGG FLOWGRIDS are used to measure the velocity pressure accross the complete duct to provide a differential air pressure measurement. When used in conjunction with the P-Sensor or any CMR Transmitter, they provide a stabil and accurate airvolume measurement which can be used for critical variable or constant air volume control, monitoring and alarming applications.