TABLE A-4 4-Post Cabinet Requirements (Continued)
Cabinet Feature | Requirement |
|
|
Airflow | The server operating airflow is 92 cfm, regardless |
| of ambient air and altitude. This airflow provides |
| appropriate cooling up to 104o F (40o C) and 10,000 |
| feet (3000 meters). |
| For proper ventilation of the server, the front and back |
| doors must comply with the following minimum open area |
| requirements. |
| • 60 percent of the area of the front door that is directly in |
| front of the server must be open. |
| • 63 percent of the area of the back door that is directly |
| behind the server must be open. |
| • Maintain a minimum of 1.5 inches (3.8 cm) clearance |
| between the server and any front or back doors. |
| If the doors of the cabinet do not meet the open area |
| requirements, remove the door or doors that do not comply. |
Vertical mounting rails | The cabinet must have two pairs of vertical mounting rails |
| (one pair in front, one pair in back) that conform to the EIA |
| (RETMA) standard for mounting hole spacing. |
| |
| mounting hole center) for front and back rails must be 17.72 |
| inches (45 cm). |
| |
| cm) and not more than 34.5 inches (87.63 cm) from the |
| outside face of the front rail to the outside face of the back |
| rail. |
| Front and back vertical rail mounting faces must be parallel |
| with each other and with the front plane of the rack. |
EMI shielding | Electromagnetic interference (EMI) shielding requirements |
| are met by the system chassis and metal side panels, which |
| remain in place when the server is rackmounted. |
Minimum service access | An area not less than 3 feet (1 meter) deep and |
| 6 feet (2 meters) wide must be available in front of |
| the cabinet, for installation and service access. |
Fire containment | The cabinet must meet Underwriters Laboratories, Inc., and |
| TUV Rheinland of N.A. requirements for fire containment. |
|
|
Appendix A Background and Reference 53
