3.2 Air-distribution Considerations for Downflow Units
• Verify that the raised floor has been properly sized for the unit’s airflow and the room is free of
airflow restrictions.
• Perforated floor tiles in the raised floor should ensure minimal pressure loss.
• The raised floor must provide 7-1/2in. (191mm) of clearance.
• A minimum of 24in. (610mm) is required to operate the fans when they are lowered with the
factory-provided jacking mechanism.
• Ensure that there is adequate clearance above the unit for service, such as replacing filters.
• Optional plenums are available for downflow unit ducting.
Figure 3.1 Downflow unit field-installed ducting and plenum ducting for DA125, DA150 and DA165
Vertiv | Liebert® DSE™ Installer/User Guide
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