The “19 inch rack”, you need to know about server racks. Server racks are open metal frames or enclosures that can store multiple electronic devices
Explaining Server Rack Dimensions - TRG Datacenters
Standards of 19-Inch Rack: depth, width ⚡️ — SysRacks Explained
Raising Electronics Server Rack Open Frame Rack 4 Post 19 inch Adjustable Server/Audio Rack Cold Rolled Steel(15U,31 Depth) : Electronics
StarTech.com 1U Server Rack Shelf - Universal Vented Rack Mount Cantilever Tray for 19 Network Equipment Rack & Cabinet - Heavy Duty Steel – Weight Capacity 44lb/20kg - 16 Deep Shelf, Black
Finally got myself a rack, and did some cable management : r/homelab
19 in. Wall Mount Open Frame Network Rack, 6U, Front-Hinged Swing Frame
Server Rack Cabinet - 42U 36in Deep - Server-Racks, Server Management
What is a Server Rack Cabinet?
Server Racks: Everything You Need to Know
19-inch rack - Wikipedia