Motorola 3460 Fast’R User Manual page 26

Fan and Deflector Requirements
Forced-air cooling for up to four rack-mounted enclosures can be
provided by fans and a deflector, mounted below the enclosures, to
provide passive, bottom-entry rear exhaust and upward-forced, front-
entry cooling air. Refer to Figure 1-6. The airflow requirement is 80
CFM (2266230 CCM).
For example, three fans rated 117 CFM (202176 CCM) at a static
pressure of 0 inches of water provide enough airflow, when cooling four
enclosures. The deflector ensures that hot air from equipment below the
enclosures does not mix with enclosure-cooling air. The cabinet must
have venting at the top or rear to let exhaust air escape.
Unit 2
Fan Chassis 2
Unit 1
Fan Chassis 1
Figure 1-6. Cabinet Arrangement — Three or More Enclosures
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3460 Fast'R
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