Hot or cold aisle computer chassis

1. A chassis for a plurality of computers for use in a data center, the chassis comprising:

at least one extensible fin, the fin being extensible perpendicularly from the front of the chassis.

2. The chassis of claim 1 wherein the fin is a collapsible accordion panel.

3. The chassis of claim 1 wherein the fin is a rigid panel with a slidable engagement with the chassis.

4. The chassis of claim 1 wherein the fin is a rigid panel with a hinged engagement with the chassis.

5. The chassis of claim 1 wherein the fin includes a connector to connect the fin to another chassis.

6. The chassis of claim 1 wherein the fin includes a connector to connect the fin to the fin of another chassis.

7. The chassis of claim 1 further comprising two fins extensible from each side of the chassis.

8. The chassis of claim 1 wherein the chassis is a chassis of a blade environment containing a plurality of blade servers.

9. A chassis for a plurality of computers for use in a data center, the chassis comprising:

at least one extensible fin, the fin being extensible parallel with the front of the chassis.

10. The chassis of claim 9 wherein the fin is a collapsible accordion panel.

11. The chassis of claim 9 wherein the fin is a rigid panel with a slidable engagement with the chassis.

12. The chassis of claim 9 wherein the fin is a rigid panel with a hinged engagement with the chassis.

13. The chassis of claim 9 wherein the fin includes a connector to connect the fin to another chassis.

14. The chassis of claim 9 wherein the fin includes a connector to connect the fin to the fin of another chassis.

15. The chassis of claim 9 further comprising two fins extensible from each side of the front of chassis.

16. The chassis of claim 15 including two additional fins on each side of the back of the chassis and extensible parallel to the back of the chassis.