Fill Empty Rack Spaces. Use Vent Panels For Cooling. Return Flange On All Panels. Tough Black FinishMaterial: Steel- Black finish. Dimensions: F122: 1/2U: Blank: 22 x 482 x 11mm F36: 1U: Blank: 44 x 482 x 11mm F37: 2U: Blank: 88 x 482 x 11mm F38: 3U: Blank: 132 x 482 x 11mm F75: 4U: Blank: 176 x 482 x 11mm F364: 5U: Blank: 220 x 482 x 11mm F365: 6U: Blank: 264 x 482 x 11mm F43: 1U: Vent Panel: 44 x 482 x 11mm F117: 2U: Vent Panel: 88 x 482 x 11mm F109: 3U: Vent Panel: 132 x 482 x 11mm. A range of 19" black- rack mounting panels for filling holes in racks or manufacturing customised panels. Order code F43 and F117 are punched with slots for ventilation purposes. F109 is punched to accept up to three 120mm (F24) fans for forced ventilation. All the panels have a return flange on the top and bottom edge which stabilises the panel and stops them bending.