Patent ID: 7990726

Claim:
A tray-type structure device that is inserted into a slot of a housing in which a plug-in unit is accommodated, comprising: a side plate; a front plate at a forward end of said side plate, said front plate being positioned on a front side of the housing, and having opening and closing functions; a top plate at an upper end of said side plate, said top plate having a plurality of openings formed therethrough and having a function of variably setting a ventilation resistance; a bottom plate at a lower end of said side plate, said bottom plate having a plurality of openings formed therethrough and having a function of variably setting a ventilation resistance; and a back plate at a rearward end of said side plate, said back plate being positioned on a side of the housing toward a backboard and having opening and closing functions, the tray-type structure device having a tray structure having a tray-like shape formed by said front plate, said top plate, said bottom plate, said side plate and said back plate.