6
Sun Fire T1000 Server Site Planning Guide • July 2006
Electrostatic discharge (ESD) is easily generated and less easily dissipated in areas
where the relative humidity is below 35%, and becomes critical when levels drop
below 30%.
Airflow Considerations
■
Ensure unobstructed airflow through the chassis.
■
Inlet air enters at the front of the server and exits from the back.
■
Ventilation openings such as cabinet doors, for both the inlet and exhaust of the
server should provide a minimum open area of 33.3 in.
2
(215 cm
2
) each. This
equates to a 60% open area perforation pattern across the front and rear area of
the server (17.5 in. x 3.2 in.; 445 mm x 81 mm). The impact of other open area
characteristics that are more restrictive should be evaluated by the user.
■
Front and rear clearance of the server should allow a minimum of 0.2 in. (5 mm)
at the front of the system and 3.1 in. (80 mm) at the rear of the server when
mounted. These clearance values are based on the inlet and exhaust impedance
(available open area) and assume a uniform distribution of the open area across
the inlet and exhaust areas. Clearance values greater than these might improve
cooling performance.
Note –
The combination of inlet and exhaust restrictions such as cabinet doors and
the spacing of the server from the doors can affect the cooling performance of the
server and should be evaluated by the user. The server placement is particularly
important for high temperature NEBS environments where the server inlet ambient
temperature is 131˚F (55˚C).
■
Care should be taken to prevent recirculation of exhaust air within a rack or
cabinet.
■
Cables should be managed to minimize interfering with the server exhaust vent.
■
Air temperature rise through the system is approximately 59˚F (15˚C).
