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A screwless wind conduit positioning device serves to position a wind conduit to a rear plate of a computer mainframe. The wind conduit is a curved tube having a heat dissipating fan at its lateral side. A front surface the wind conduit are formed with a plurality of tenons and hooks which are arran

A screwless wind conduit positioning device serves to position a wind conduit to a rear plate of a computer mainframe. The wind conduit is a curved tube having a heat dissipating fan at its lateral side. A front surface the wind conduit are formed with a plurality of tenons and hooks which are arranged at opposite sides. The rear plate of the computer mainframe has a thin plate on the surface thereof. The thin plate has a section with a plurality of wind vents arranged like the net. The periphery of the wind vents are installed with a plurality of engaging holes for being engaged with the tenons of the wind conduit. The hooks on the front surface of the wind conduit slide in a bank of wind vents on the section of the thin plate for being retained therein. Therefore, the wind conduit can be fixed to the rear plate of a computer mainframe without using any tool. Then a lateral plate with a folding plate is hooked to the rear plate, and then screws serve to fix the lateral plate to the rear plate. The folding plate serves to enhance and confine the tenons. Even it is transferred, the wind conduit will not separate from the rear plate.

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1. An air conduit apparatus for a computer housing comprising:a first housing plate member having formed through at least a portion thereof a plurality of vent openings and a plurality of engaging holes; a conduit assembly coupled to said first housing plate, said conduit assembly including a front

1. An air conduit apparatus for a computer housing comprising:a first housing plate member having formed through at least a portion thereof a plurality of vent openings and a plurality of engaging holes; a conduit assembly coupled to said first housing plate, said conduit assembly including a front peripheral portion having a plurality of tenons and at least one hook formed to project therefrom, said tenons each retentively engaging one of said engaging holes, said hook retentively engaging at least one of said vent openings; and, a second plate having a folding plate portion fastened to said first plate, said folding plate portion confining said conduit assembly to maintain said tenons engaged with said first plate engaging holes.