Abstract: A safety device comprising a support harness that includes at least one safety cable, and preferably a pair of safety cables. The end of the safety cable has a snap hook designed to releasably connect to the structure. In application, the safety harness is worn by the worker and as the worker ascends or descends the structure, the worker continuously releases and then connects one of the snap hooks to the structure such that at least one safety cable is connected to the structure at all times. The safety harness includes sensors for detecting whether the worker is ascending or descending the structure, for detecting whether at least one of the snap hooks are connected to the structure, and detecting when the worker is attempting to open the snap hook.

Abstract: An apparatus for providing cool air to electronic module cabinets wherein a plurality of electronic modules are stacked within a cabinet such that front surfaces of the modules face a front cabinet opening, the apparatus including a plenum door assembly having an inlet for receiving cooling air and a plurality of outlets, the outlets positioned proximate the front faces of the electronic modules so as to provide cool air thereto, the modules in some embodiments having fans that draw air to back sides of the modules opposite the front surfaces, the plenum openings being adjustable to modify the amount of cooling air being delivered to the modules.