Patent ID: 8540558

Claim:
A cooling auxiliary unit used for an accommodation room configured to accommodate one or more electronic apparatuses, said cooling auxiliary unit comprising: a duct member that stands upon a ventilation hole provided in a raised floor, and has an air passage connected to the ventilation hole, and at least one opening connected to the air passage; and a fan that moves air along the air passage, wherein the duct member includes: a top plate configured to shield the air passage; a first duct part that includes a first exhaust surface facing a predetermined direction parallel to the raised floor and intersecting a central axis of the duct member perpendicular to the raised floor, the first duct part having a first width, and the first exhaust surface having at least one of the openings; and a second duct part that is provided between the first duct part and the top plate and includes a second exhaust surface having at least another of the openings in the predetermined direction, a width of the second duct part gradually increasing in a direction from the first duct part to the top plate, wherein 2.1Px≦Dc≦13Px is met where Px is the first width, and Dc is a second width of the top plate.