Abstract: Embodiments of the invention provide a venturi valve and control system for use in an indoor environment to regulate air flow. The venturi valve includes a substantially cylindrical pipe, a high pressure sensing assembly, a low pressure sensing assembly, a differential pressure transducer, and a damper assembly. The high pressure sensing assembly and the low pressure sensing assembly do not substantially impede air flow through the valve. A controller is connected to the differential pressure transducer and a damper actuator. The controller determines a current flow rate of air into the indoor environment and operates the damper actuator in order to provide a desired flow rate of air into the indoor environment.

Abstract: A room monitor having a second display includes a controller, a first display and a second display. The first display is preferably a touch screen monitor, which allows the entry of data into the controller without the need for a keyboard. However, the controller may be programmed through a keyboard. The controller includes a plurality of inputs and outputs for monitoring and/or controlling such room environmental factors as pressure, temperature, humidity and lighting. The inputs are used to read sensors. The outputs are used to actuate control devices. The first display includes a plurality of menus for controlling at least one environmental factor. The second display shows information the condition of a critical environment room. There is at least one message displayed on the second display. A second embodiment of the room monitor includes a controller and the first display. The first display must be a touch screen monitor.