Thus, all of the relevant louvers of all of the separately controlled louver systems 210, 212, 214, are open when all fans are operational. However, upon failure of a fan (or other reason for termination of operation of at least one fan while other fans associated with the same air circulation system operate), the louvers or separately controlled louver system associated with the terminated or failed fan are closed. In disclosed embodiments, upon failure of a fan, the louvers or separately controlled louver system close above the failed fan close due to gravity and the force of the air flow from the remaining operational fans does not recirculate through the failed fan. Instead, the air moves across the components, thereby maintaining the temperature of the components at the manufacturer's specified temperature.

One or more of the louvers 210 that intersect one or more of the conical air transfer diverter mechanisms 205 (e.g., louvers 210d-210g in FIG. 10) may be designed such that the louvers 210d-210g do not cover the intersected air transfer diverter mechanism 205. For example, the shielding portion of the louvers 210d-210g may be narrowed or eliminated along the segments of the louvers 210d-210g that intersect a conical air transfer diverter mechanism 205.

The self-activating louver systems are shown as integrated within the air collimator. However, it is within the principles of the invention to provide the self-activating louver systems separate but nevertheless adjacent to the air collimator.