EFV1 and EFV2 are boards for the measurement of air pressure. EFV1 is equipped with a single sensor to monitor the pressure inside the booth. The EFV2 board, in addition to the sensor present in EFV1, can measure four additional pressures. Using EFV2 allows for the monitoring of the clogging of the intake and aspiration filters.

Both EFV1 and EFV2 can be installed directly on the CFV1 board and only require to be connected, via flexible tubes, to the locations of the booth and air conduits they are to monitor.