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A computer system includes an enclosure, a forced air cooling system configured to create air flow within the enclosure, a printed circuit board and an air flow blockage member. The printed circuit board is within the enclosure and includes a plurality of connectors including a first connector and a

A computer system includes an enclosure, a forced air cooling system configured to create air flow within the enclosure, a printed circuit board and an air flow blockage member. The printed circuit board is within the enclosure and includes a plurality of connectors including a first connector and a second connector separated by a first space. The air flow blockage member is proximate the first space and is movable between at least a first open position and a second open position distinct from the first open position.

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What is claimed is: 1. A computer system comprising: an enclosure; a forced air cooling system configured to create air flow within the enclosure; a first printed circuit board within the enclosure and including a plurality of connectors including a first connector and a second connector separated

What is claimed is: 1. A computer system comprising: an enclosure; a forced air cooling system configured to create air flow within the enclosure; a first printed circuit board within the enclosure and including a plurality of connectors including a first connector and a second connector separated by a first space; a first air flow blockage member proximate the first space and movable between a first open position and a second open position distinct from the first open position; an actuator configured to move the first air flow blockage member between the first position and the second position; and a processor unit configured to generate control signals, wherein the actuator moves the first air flow blockage member in response to the control signals. 2. The system of claim 1, wherein the first blockage member is further movable to a fully closed position. 3. The system of claim 1 including a manual input coupled to the processor unit, wherein the processor unit generates the control signals based upon the entries from the manual input. 4. The system of claim 1 including: a first replaceable unit having a second printed circuit board connected to the first connector; and a detector configured to detect a characteristic of the first replaceable unit and in communication with the processor unit, wherein the processor unit generates the control signal based at least in part upon the detected characteristic of the first replaceable unit. 5. The system of claim 1 including at least one sensor configured to sense at least one air characteristic proximate the first space, wherein the processor unit generates the control signal based at least in part upon the sensed air characteristic. 6. The system of claim 1 including a first replaceable unit having a second printed circuit board connected to the first connector and a temperature sensor coupled to the second printed circuit board, the temperature sensor being configured to sense a temperature of at least one component coupled to the second printed circuit board, wherein the processor unit generates the control signal based at least in part upon the sensed temperature. 7. The system of claim 1, wherein the actuator comprises a solenoid. 8. The system of claim 1 including: a first replaceable unit having a second printed circuit board and an identifier; and a detector configured to read the identifier to determine at least one characteristic of the first replaceable unit, wherein the detector is in communication with the processor unit and wherein the processor unit generates the control signals based at least in part upon the determined at least one characteristic of the first replaceable unit. 9. The system of claim 1, wherein the first printed circuit board includes a third connector separated from the second connector by a second space and wherein the system further includes: a second air flow blockage member proximate the second space and movable between a first open position and a second open position distinct from the first open position. 10. The system of claim 1, wherein the first air flow blockage member pivots between the first open position and the second open position. 11. The system of claim 1, wherein the first air flow blockage member translates between the first open position and the second open position. 12. The system of claim 1, wherein the first air flow blockage member includes a plurality of louvers. 13. The system of claim 1, wherein the system includes a first perforated plate and wherein the first air flow blockage member includes a second perforated plate proximate the first perforated plate. 14. The system of claim 8, wherein the identifier includes recorded optical data and wherein the detector includes an optical reader. 15. The system of claim 8, wherein the identifier includes recorded magnetic data. 16. The system of claim 8, wherein the identifier includes an armature having at least one armature characteristic identifying a characteristic of the first replaceable unit and wherein the detector includes a transformer configured to detect the at least one armature characteristic. 17. The system of claim 9 including: at least one actuator configured to independently move the first air flow blockage member and the second air flow blockage member; and a processor unit configured to generate control signals, wherein the at least one actuator moves the first air flow blockage member and the second air flow blockage member in response to the control signals. 18. The system of claim 16, wherein the armature has a length associated with the characteristic of the first replaceable unit. 19. The system of claim 17 including: a first replaceable unit having a second printed circuit board connected to the first connector; and a second replaceable unit having a third printed circuit board connected to the second connector. 20. The system of claim 17 including: at least one first sensor configured to sense at least one air characteristic proximate the first space; and at least one second sensor configured to sense at least one second air characteristic proximate the second space, wherein the processor unit generates the control signals based upon the at least one sensed first air characteristic proximate the first space and proximate the second space. 21. The system of claim 17 including: a first replaceable unit having a second printed circuit board connected to the first connector; and a second replaceable unit having a third printed circuit board connected to the second connector. 22. The system of claim 17 including: a first replaceable unit having a second printed circuit board and at least one component coupled to the second printed circuit board connected to the first printed circuit board via the first connector; and at least one sensor configured to sense at least one air characteristic adjacent the second printed board, wherein the processor unit is configured to generate control signals to move at least one of the first air flow blockage member and the second air flow blockage member to increase air flow adjacent the first replaceable unit when the sensed at least one air characteristic meets a predefined criteria. 23. The system of claim 17 including: a replaceable unit having a second printed circuit board connected to the first printed circuit board via the first connector and at least one component coupled to the second printed circuit board; and at least one sensor configured to sense the temperature of the at least one component coupled to the second printed circuit board, wherein the processor unit is configured to generate control signals to move the first air flow blockage member to increase air flow adjacent the first replaceable unit when the sensed temperature of the at least one component coupled to the second printed circuit board meets a pre-selected criteria. 24. The system of claim 19 including: a first detector configured to detect at least one first characteristic of the first replaceable unit; and a second detector configured to detect at least one second characteristic of the second replaceable unit, wherein the first detector and the second detector communicate with the processor unit and wherein the processor unit is configured to generate control signals based at least in part upon the detected at least one first characteristic of the first replaceable unit and the at least one characteristic of the second replaceable unit. 25. The system of claim 19, wherein the first replaceable unit includes a first component coupled to the second printed circuit board and wherein the second replaceable unit includes a second component distinct from the first component and coupled to the third printed circuit board. 26. The system of claim 19, wherein the first replaceable unit includes a component coupled to the second printed circuit board, wherein the component is selected from a group including: capacitors, resistors, inductors, LEDs, routers, modems, integrated circuits, memory, processor, hard disk drives and controllers. 27. The system of claim 19, wherein the first replaceable unit comprises a blade including a component coupled to the printed circuit board, wherein the component is selected from the group including: routers, modems, integrated circuits, memory, processor, hard disk drives and controllers. 28. The system of claim 19, wherein the processor unit is configured to prioritize cooling requirements of the first replaceable unit and the second replaceable unit and wherein the processor unit generates control signals to move the first air flow blockage and the second air flow blockage member based at least in part upon such priorities. 29. The system of claim 20, wherein the processor unit is configured to generate control signals to move the first air flow blockage member based at least in part upon the at least one second sensed air characteristic proximate the second space. 30. The system of claim 21 including: a first temperature sensor coupled to the second printed circuit board and configured to sense a first temperature of at least one component coupled to the second printed circuit board; and a second temperature sensor coupled to the third printed circuit board and configured to sense a second temperature of at least one component coupled to the third printed circuit board, wherein the processor unit generates control signals based at least in part upon the first sensed temperature of the at least one component coupled to the second printed circuit board and the second sensed temperature of the at least one component coupled to the third printed circuit board. 31. The system of claim 24, wherein the processor unit is configured to generate control signals to move the first air flow blockage member based at least in part upon the detected at least one second characteristic of the second replaceable unit. 32. The system of claim 24, wherein the detected at least one first characteristic and the detected at least one second characteristic includes heat generating characteristics of the first replaceable unit and of the second replaceable unit, respectively. 33. The system of claim 30, wherein the processor unit is configured to generate control signals for moving the first air flow blockage member based at least in part upon the second sensed temperature of the at least one component coupled to the third printed circuit board. 34. The system of claim 31, wherein the at least one first detected characteristic and the at least one second characteristic include component density of the first printed circuit board and of the second printed circuit board, respectively. 35. A replaceable unit for use with a computer system having a first printed circuit board having a first connector and a second connector separated by a space, a forced air cooling system, an air flow blockage member proximate the space, an actuator configured to move the air flow blockage member and a processor unit configured to generate control signals, wherein the actuator moves the air flow blockage member in response to the control signals, the unit comprising: a second printed circuit board; at least one component coupled to the second printed circuit board; and an information source coupled to the second printed circuit board, wherein the information source is in communication with the processor unit and wherein the control signals generated by the processor unit are based at least in part upon information communicated to the processor unit from the information source. 36. The unit of claim 35, wherein the information source includes an identifier configured to communicate information regarding at least one characteristic of the at least one component. 37. The unit of claim 35, wherein the information source includes at least one temperature sensor coupled to the second printed circuit board and configured to sense a temperature of the at least one component on the second printed circuit board, wherein the processor unit generates control signals based upon the sensed temperature. 38. The unit of claim 35, wherein the at least one component is selected from a group including: capacitors, resistors, inductors, LEDs, routers, modems, integrated circuits, memory, processor, hard disk drives and controllers. 39. The unit of claim 35, wherein the unit comprises a blade and wherein the at least one component is selected from a group including: routers, modems, integrated circuits, memory, processor, hard disk drives and controllers. 40. The unit of claim 36, wherein the computer system includes a detector comprising an optical reader and wherein the information source includes recorded optical data. 41. The unit of claim 36, wherein the identifier includes recorded magnetic data. 42. The unit of claim 36, wherein the computer system includes a detector comprising a transformer and wherein the identifier includes an armature having at least one characteristic associated with a characteristic of the replaceable unit. 43. The unit of claim 42, wherein the armature has a length associated with the characteristic of the replaceable unit. 44. A method for cooling a computer system having an enclosure, a first printed circuit board having first, second and third consecutive connectors within the enclosure, a second printed circuit board connected to the first printed circuit board at the first connector, a third printed circuit board connected to the first printed circuit board at the second connector and separated from the second printed circuit board by a first space, a fourth printed circuit board connected to the first printed circuit board at the third connector and separated from the third printed circuit board by a second space, a first component coupled to the second printed circuit board and extending within the first space, and a second component coupled to the third printed circuit board and extending within the second space, the method comprising: forcing air towards the first space and the second space; and blocking air flow through the first space and the second space to different degrees. 45. The method of claim 44, wherein the air flow is selectively blocked to different degrees based upon at least one characteristic of one or more components coupled to at least one of the second printed circuit board and the third printed circuit board. 46. The method of claim 44 including reading a first identifier coupled to the second printed circuit board and a second identifier coupled to the third printed circuit board. 47. The method of claim 44, wherein the step of selectively blocking includes pivoting a first air flow blockage member proximate the first space and pivoting a second air flow blockage member proximate the second space. 48. The method of claim 44, wherein selectively blocking includes translating a first air flow blockage member proximate the first space and translating a second air flow blockage member proximate the second space. 49. The method of claim 44 including manually entering information to a processor unit identifying at least one characteristic of components coupled to the second printed circuit board and components coupled to the third printed circuit board. 50. The method of claim 45, including detecting at least one characteristic of the second printed circuit board and of the third printed circuit board. 51. The method of claim 47, wherein the first air flow blockage member is pivoted between at least three positions and wherein the second air flow blockage member is pivoted between at least three positions. 52. The method of claim 50 including detecting a first component density of the second printed circuit board and a second component density of the third printed circuit board.