This is an inexpensive 3U preform that is also handy for stabilizing a taller rack by mounting it in the center back if the rack lacks such a piece. contain air when fan cooled and trying to create a cooling chimney effect.
NavePoint 1U Black Vented Rack Tray Shelves - Universal Design, 8 Inches (210mm Deep), No Lip
11 Review
NavePoint 12U Wall Mount Network Server Cabinet Rack Enclosure with Glass Door and Locking Mechanism
10 Review
π© Lancher 60-Pack Black Cage Nuts and Screws for Server Rack Mounts - M6 x 16mm - 1U, 2U, 6U, 12U Cabinets and Shelves
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Wall mount ONKRON TM1 for TV 17"-43", inclined, up to 30 kg, black
13 Review