I heard it's really good at funneling the sound.
From the submitter:
A roll of plastic and three hours later, we could completely turn off one of the cooling units, which had been on full blast for years. The servers now breath in only cold air from the cooling units, and the cooling units only warm air from the servers.
Frankly, I am shocked and appalled that they found the blueprints to TIFI's server room.