An electronics assembly, for example a computer, comprises an enclosure, and a heat-generating component located within the enclosure. The assembly has a plurality of hollow fiber filtering membranes disposed generally vertically between two solid bodies, an enclosure sealed to the upper solid body to define a cavity, a permeate port in communication with the cavity and the lumen of each membrane in fluid communication with the port via the cavity. The filter array is also mechanically mounted to the frame and has a plurality of filter groupings in fluid communication with the inlet on the plenum. The room atmosphere conditions controlled by the atmosphere circuit are divided into audio condition, light condition, and temperature condition. A biasing member biases the valve member in one direction and a solenoid applies a drive force to the valve member in an opposite direction. This allows the indoor units to automatically detect problems with outdoor unit and download new software to them in case of an error.