Patent ID: 8292705

Claim:
A subrack comprising: a shelf which accommodates electronic components; and a fan unit arranged above the electronic components and including a plurality of radial fans, which includes a plurality of groups of radial fans, and a unit casing which accommodates the radial fans and includes a rear member and a side member, each of which has exhaust ports allowing transmission of at least a part of output air from the radial fans, wherein the radial fans of each of the plurality of groups are arranged in a row parallel to the rear member, wherein the plurality of groups of radial fans are arranged in a plurality of rows staggered with respect to the radial fans of an adjacent row, wherein at least one air flow passage to the exhaust ports is formed for each of said plurality of radial fans, wherein for at least one of said plurality of radial fans air is exhausted via a plurality of air flow passages to exhaust ports disposed on side and rear members, wherein the shelf is equipped with a side member, a rear member, a front member, and a bottom member, wherein at least one of the side member, the rear member, and the front member has an intake port formed at a position adjacent to the bottom member, and wherein the side member of the shelf has a side surface opening formed in correspondence with at least a part of the exhaust sort formed in the rear member or the side member of the unit casing, and a position of the side surface opening is determined so that the output air from the radial fan is directly discharged to an exterior.