A system for sampling air at multiple locations in a controlled environment comprising: a first air sampling device configured to draw a first volume of air and a second air sampling device configured to draw a second volume of air from within a controlled environment; a first vacuum connection, in flow communication with a vacuum pump via a manifold, configured to receive the first volume of air from the first air sampling device; and a second vacuum connection, in flow communication with the vacuum pump via the manifold, configured to receive the second volume of air from the second air sampling device; an operator interface terminal including a graphical user interface GUI configured to provide functionality for a user to specify one or more setpoints indicative of a first desired mass flow rate through the first air sampling device and a second desired mass flow rate through the second air sampling device; a first flow control valve configured to control the actual mass flow rate of the first volume of air through the first vacuum connection and a second flow control valve configured to control the actual mass flow rate of the second volume of air through the second vacuum connection; a first actuator configured to open and close the first flow control valve and a second actuator configured to open and close the second flow control valve; a first flow sensor configured to sense a first measured mass flow rate of the first volume of air through the first vacuum connection and a second flow sensor configured to sense a second measured mass flow rate of the second volume of air through the second vacuum connection; a flow center including a programmable logic controller PLC configured to: receive the setpoints indicative of the first desired mass flow rate and the second desired mass flow rate; receive the first measured mass flow rate and the second measured mass flow rate; determine a difference between the first desired mass flow rate and the first measured mass flow rate caused by a change in the second volume of air; output a control signal to the first actuator to reduce the difference between the actual mass flow rate of the first volume of air and the first desired mass flow rate. a first air sampling device configured to draw a first volume of air and a second air sampling device configured to draw a second volume of air from within a controlled environment; a first vacuum connection, in flow communication with a vacuum pump via a manifold, configured to receive the first volume of air from the first air sampling device; and a second vacuum connection, in flow communication with the vacuum pump via the manifold, configured to receive the second volume of air from the second air sampling device; an operator interface terminal including a graphical user interface GUI configured to provide functionality for a user to specify one or more setpoints indicative of a first desired mass flow rate through the first air sampling device and a second desired mass flow rate through the second air sampling device; a first flow control valve configured to control the actual mass flow rate of the first volume of air through the first vacuum connection and a second flow control valve configured to control the actual mass flow rate of the second volume of air through the second vacuum connection; a first actuator configured to open and close the first flow control valve and a second actuator configured to open and close the second flow control valve; a first flow sensor configured to sense a first measured mass flow rate of the first volume of air through the first vacuum connection and a second flow sensor configured to sense a second measured mass flow rate of the second volume of air through the second vacuum connection; a flow center including a programmable logic controller PLC configured to: receive the setpoints indicative of the first desired mass flow rate and the second desired mass flow rate; receive the first measured mass flow rate and the second measured mass flow rate; determine a difference between the first desired mass flow rate and the first measured mass flow rate caused by a change in the second volume of air; output a control signal to the first actuator to reduce the difference between the actual mass flow rate of the first volume of air and the first desired mass flow rate. receive the setpoints indicative of the first desired mass flow rate and the second desired mass flow rate; receive the first measured mass flow rate and the second measured mass flow rate; determine a difference between the first desired mass flow rate and the first measured mass flow rate caused by a change in the second volume of air; output a control signal to the first actuator to reduce the difference between the actual mass flow rate of the first volume of air and the first desired mass flow rate.