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The recording of volumetric air flows is of exceptional importance for the calculation of emitted mass flows from animal houses. Broiler houses are characterised by a large requirement for air volumes, meaning that ventilators with a wide diameter (92 cm) are used. The measurement of air flow volumes with differential pressure systems based on the standardised ISO Norm 5801 can be used as an alternative to the usual measuring fans. The measuring procedure requires an inlet nozzle which is very simple to produce and can be flange-mounted before the fan duct. There are, however, particular requirements that need to be considered in the installation and these are discussed in this paper. In order to test the measuring accuracy of the procedure, a fan module (8,000 27,440 m/h) with a defined inlet nozzle was tested on a calibrated test rig. The measured average deviation for different air flows was found to be 1.5% for the tested ventilator module without calibration. With calibration, a correction factor can be calculated and the measuring accuracy increased.