Sun Oracle SPARC T4-1 Installation Manual page 21

Ensure that the server ventilation openings used for intake and outflow of air
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provide an open area that is at least 60% of the open area perforations across the
front and rear of the server. This 60% minimum open area equates to the following
measurements:
Metric Units
2
224.4 cm (425 mm x 88 mm)
Allow a minimum of 5 mm (0.2 in) clearance from the ventilation opening at the
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front of the server and 80 mm (3.1 in) at the rear of the server when mounted.
These clearance values are based on the preceding 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 are recommended
for improved 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.
Take care to prevent recirculation of exhaust air within a rack or cabinet.
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Manage cables to minimize interfering with the server exhaust vent.
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Related Information
"Minimum Clearance for Service Access" on page 9
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"Environmental Specifications" on page 11
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"Acoustic Noise Emissions" on page 12
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US Units
2
34.8 in (16.7 in x 3.5 in)
Confirming Server and Site Specifications 13