The main benefit of regular canopy and duct cleaning, in any business, is that it ensures a safe working environment.
Poorly maintained systems reduce the air quality, affecting the health of all employees.
Regular cleaning greatly reduces the risk of fire and personal injury. A kitchen with poor hygiene standards also breaches health and safety laws which has significant consequences for a business. If you are unlucky enough to have a fire, an insurance company can refuse to pay out if your kitchen extract system has not been regularly cleaned.