A method for collecting a volume of air from one or more clean rooms within a facility, comprising the steps of: providing a plurality of air sampling devices each within one of the one or more clean rooms; providing a vacuum source; providing a first controller, outside the one or more clean rooms, having a plurality of individual modular ports, each port being in flow communication with the vacuum source via a hose and a respective air sampling device via a respective vacuum air line, the vacuum source creating air flow through the hose; characterized in that the method further comprises providing a plurality of flow switch modules, each within the clean room of a respective one of the plurality of air sampling devices and in flow communication with the respective air sampling device via a respective atrium flow line, each port of the first controller being in flow communication with a respective flow switch module via a respective vacuum air line, the first controller separating the air flow among the vacuum air lines to draw air from each air sampling device via the respective vacuum air line, the respective flow switch module, and the respective atrium flow line, each flow switch module comprising a respective start button for activating an air sampling cycle at the respective air sampling device, each flow switch module comprising a flow detector that detects the actual flow rate of air coming from the respective atrium air flow line and passing through to the respective vacuum air line; communicating a control signal, from any of the plurality of flow switch modules to the first controller in response to activation of the respective start button, to initiate an air sampling cycle at the respective air sampling device; initiating the air sampling cycle at each air sampling device communicating the control signal to initiate the air sampling cycle, by the first controller, by activating the vacuum source and drawing air through the respective vacuum air line; detecting, by the flow detector of each flow switch module communicating the control signal to initiate the air sampling cycle, the actual flow rate through the respective flow switch module; and determining, by the flow detector of each flow switch module communicating the control signal to initiate the air sampling cycle, whether the actual flow rate through the respective flow switch module is within a predefined range. providing a plurality of air sampling devices each within one of the one or more clean rooms; providing a vacuum source; providing a first controller, outside the one or more clean rooms, having a plurality of individual modular ports, each port being in flow communication with the vacuum source via a hose and a respective air sampling device via a respective vacuum air line, the vacuum source creating air flow through the hose; characterized in that the method further comprises providing a plurality of flow switch modules, each within the clean room of a respective one of the plurality of air sampling devices and in flow communication with the respective air sampling device via a respective atrium flow line, each port of the first controller being in flow communication with a respective flow switch module via a respective vacuum air line, the first controller separating the air flow among the vacuum air lines to draw air from each air sampling device via the respective vacuum air line, the respective flow switch module, and the respective atrium flow line, each flow switch module comprising a respective start button for activating an air sampling cycle at the respective air sampling device, each flow switch module comprising a flow detector that detects the actual flow rate of air coming from the respective atrium air flow line and passing through to the respective vacuum air line; communicating a control signal, from any of the plurality of flow switch modules to the first controller in response to activation of the respective start button, to initiate an air sampling cycle at the respective air sampling device; initiating the air sampling cycle at each air sampling device communicating the control signal to initiate the air sampling cycle, by the first controller, by activating the vacuum source and drawing air through the respective vacuum air line; detecting, by the flow detector of each flow switch module communicating the control signal to initiate the air sampling cycle, the actual flow rate through the respective flow switch module; and determining, by the flow detector of each flow switch module communicating the control signal to initiate the air sampling cycle, whether the actual flow rate through the respective flow switch module is within a predefined range.