A Pneumatic VAV Controller is a specialised piece of equipment whose purpose is to ensure that the air distribution and control in your HVAC system runs to an exact specifications. This helps to keep the interior environment in which it is used comfortable, safe and efficient. It operates on pneumatic, or air-operated technology, allowing you to regulate the flow volume of air automatically and accurately into your building with close calibration between the space temperature and the outdoor weather conditions. By setting upper, lower and deadband ranges, you can make sure that your system maintains optimal performance.