Patent ID: 11970049
Assignee: BREATHESAFE PTY LTD
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 8:
9. A system for controlling dust in a cabin, the cabin comprising a shell separating a cabin interior from an external environment containing dust, the system comprising:
a positive pressure unit comprising a channel extending from an air intake to the cabin interior and a positive pressure fan in communication with the channel, wherein the positive pressure fan can cause air from the external environment to pass from the air intake, through a first filter, and to the internal environment to pressurize the cabin;
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 second filter and to be redelivered to the cabin interior; and
a control system in communication with the positive pressure unit and the air circulation unit, the control system comprising a controller, a pressure detector, and a dust detector, wherein the controller receives a pressure input signal from the pressure detector related to a pressure condition in the cabin and wherein the controller generates a pressure output signal in response to the pressure input signal, the pressure output signal being delivered to the positive pressure unit to control the operation thereof, and wherein the controller receives a dust level input signal from the dust detector related to a dust level condition in the cabin and wherein the controller generates a dust level output signal in response to the dust level input signal, the dust level output signal being delivered to the air circulation unit to control the operation thereof, and wherein when the dust level condition exceeds a predetermined value, the dust level output signal from the controller causes the positive pressure unit to increase the fan speed of the positive pressure fan.