Abstract: A data storage library system includes at least one data storage library, the at least one data storage library comprising at least one library frame, wherein the at least one library frame has at least one environmental conditioning unit configured to control one or more environmental conditions within the at least one library frame. The system also includes at least one access door for providing access to an interior portion of the at least one library frame, a library controller, and at least one louver, where the louver may be selectively moveable to control a communication pathway for external air to enter the at least one library frame. In one embodiment, the at least one louver may be controlled by the library controller to automatically open when it is detected that the one or more access doors are opened, and to close the louver when the one or more access doors are closed.