Abstract: An electronic computer card guide support bracket is mounted inside a chassis near a ventilation fan. The support bracket has a sheet metal body with sidewalls which extend between a face of the support bracket and the chassis. The sidewalls form ducts for the ventilation fan. The support bracket also has parallel guide members which are integrally formed with the body along its face. Each guide member has upper and lower rails which define a variable width slot between them for receiving a PCI card. The portions of the PCI cards which contact the support bracket are electrically insulated. An electrically insulated guide member is also mounted to the support bracket for receiving an FSIOA card which may not be insulated. An aperture is located between each adjacent pair of the guide members for permitting air flow to circulate around the PCI cards. Each aperture has an area which is larger than a frontal surface area of each guide member.

Abstract: A cooling system for a host device affords enhanced reliability using multiple blower units mounted in parallel between a low pressure plenum and a high pressure plenum and a control system that senses when a blower unit is failing or has failed and responds by shutting down the failed unit and increasing the speed of the remaining blowers to maintain the air flow volume delivered to the cooling path. To maintain the integrity of the cooling air path while affording continuous operation of the host device, a spring biased closure door seals the access opening through which the blower is mounted when a blower unit is removed and displaced by the blower unit to an inoperative position against the biasing force of the spring when the blower unit is installed or replaced. To prevent recirculation through a vacated blower unit mounting space, a one way air flow device, in the form of a shutter assembly including plural pivoting louvers or vanes is mounted at the exhaust location of each blower.