Many data centers with raised floors have pipe penetrations for cooling water and other needs. Often these pipes or conduit are against a wall where it is difficult to fully deal with a brush grommet. The front side of the pipes get sealed but typically the back side remains unsealed as the brushes can't re-close on the backside of a pipe. This is where the PolarDAM Air Dam Foam is far superior to brush grommets like those from KoldLok or AirGuard. Pictured below are some great examples of sealing pipes.

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