Patent ID: 8675357

Claim:
A system for controlling the flow of air over the top of racks containing computer servers arrayed in rows in a room comprising: a computer rack door with openings which allow air flow through the door, channels attached to the sides of the door, arrayed parallel to the sides of the door, with the tops of the channels near the top of the door, a rectangular air impermeable sash capable of mounting on the door through interaction of the side edges of the sash with the channels, the sash vertically movable from a lower position wherein the top edge of the sash is approximately adjacent to the top edge of the door, and the upper position in which the top edge of the sash is capable of close proximity to the ceiling of the room, seals on the top edge and the side edges of the sash, when in the upper position the seal on the top edge capable of a sealing interaction with the ceiling and when in the upper position the seals on the side edges capable of a sealing interaction with seals on adjacent sashes also in the upper position, an elevation mechanism capable of elevating and lowering the sash between the lower and upper positions, the elevation mechanism capable of operation in response to signals from a control mechanism, and a control mechanism capable of signaling the elevation mechanism.