The regular inspection and cleaning of ventilation systems guarantees the owner a perfect hygienic and technical condition of his ventilation system and can also contribute to energy savings. Contamination of the ventilation ducts leads to discrepancies in air flow, which has an effect on the indoor climate and thus on the indoor air quality.

If the volume flows calculated according to the ventilation concept are no longer achieved, the fan power is often simply increased, resulting in additional energy consumption. This is not inevitable. One solution for cleaning small rectangular or round air ducts is compressed air cleaning using the Wöhler helicopter nozzle.