Regular cleaning of ventilation and air conditioning systems provides clean air for breathing without odours. The wellbeing and performance of employees are maintained. Clean ambient air increases the service life of precision-mechanical machines and electronic instruments in ventilated or air conditioned rooms. Clean air ducts and exhausts considerably reduce fire hazards. Cleanliness maintains the maximum efficiency of the air duct system. This warrants economic operation, and reduces the necessity of repairs. Regular cleaning provides legal safety for the operator by compliance with applicable regulations.