The ventilation system has a huge influence on a property’s indoor air quality. A clean ventilation system provides fresher air, which keeps occupants more alert and productive, while helping to reduce sickness and absence levels. Cleaning a ventilation system is an expert task. It requires compliance with TR/19, the leading industry guidance document on the internal cleanliness of ductwork systems. Under the latest version, your ventilation systems must be classified as high, medium or low, according to its usage and purpose; and must be regularly cleaned according to clearly laid out guidelines. Our handy compliance checker can help you find out how often your building needs our help.