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The depth of the plenum in a datacenter with a raised floor has an effect on:
The amount of cool air that can be delivered
The requirement for safety equipment
The placement of racks
The primary effect the plenum depth has is the ability to deliver cool air from CRAC units. In a datacenter, cold air is pumped from under the floor and hot air is sucked up out through the ceiling. The wider the space is for air to circulate = the more cool air that can be circulated.
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