Heat Dissipation and Airflow Requirements

The maximum and typical rates of heat released from the expansion racks are listed below. In order to cool the system properly, ensure that adequate airflow travels through the system.

Table 66  Heat Dissipation

Rack Units Maximum Typical Full rack BTU/hour kJ/hour 43,000 45,400 30,100 31,800 Half rack BTU/hour kJ/hour 23,600 24,900 16,500 17,400 Quarter rack BTU/hour kJ/hour 11,600 12,250 8,100 8,600

Observe these additional requirements:

• Allow a minimum clearance of 914 mm (36 inches) at the front of the rack, and 914 mm (36 inches) at the rear of the rack for ventilation. There is no airflow requirement for the left and right sides, or the top of the rack.

• If the rack is not completely filled with components, cover the empty sections with filler panels.

Figure 32  Direction of Airflow Is Front to Back

Table 67  Airflow (listed quantities are approximate)

Rack Maximum Typical Full rack CFM 2,000 1,390 Half rack CFM 1,090 760 Quarter rack CFM 530 375

Related Information

• Environmental Requirements

• Perforated Floor Tiles