Abstract: A system is described for controlling dust in a cabin, such as a cabin or cabinet in a piece of mobile plant equipment. The system includes an air circulation unit comprising an air flow passageway extending from a return air intake in communication with the cabin interior to one or more conduits in communication with the cabin interior and a circulation fan in communication with the air flow passageway, wherein the circulation fan can cause air from the cabin interior to pass through a filter and to be redelivered to the cabin interior. A control system is in communication with the air circulation unit. The control system includes a controller and a detector, wherein the controller receives a input signal from the detector related to a condition in the cabin and wherein the controller generates an output signal in response to the input signal, the output signal being delivered to the air circulation unit to control the operation thereof.