Digitus rack sizing: 12U, mid-size wall cabinets and 42U floor racks

The bottom line

Use a 12U wall cabinet for a small cupboard that holds a switch, a patch panel and a modest PDU, with little growth. Use a 16U or 20U Unique wall cabinet (or an 18U cabinet from another Digitus series, if that exact part is specified) when the wall install has to take more panels, a short UPS or a second switch. Use a 42U floor cabinet when you have a dedicated rack room, heavier equipment, and a need for depth, airflow and a much higher rail load. Always check usable depth, rail load, door clearance and cable entry against the exact article number.

Current Unique sizes (do not invent a size)

According to Digitus's 2026 Network & Server Cabinet brochure and the Unique comparison tables:

• Unique wall-mount cabinets: 7U, 9U, 12U, 16U and 20U. Width 600 mm. Depths 450 mm or 600 mm. Example 12U Unique 600 × 600 mm cabinet: 643 × 600 × 600 mm, 100 kg rail load, IP20, adjustable 19-inch rails, lockable glass door, roof prepared for a fan unit. With optional levelling feet or casters, Unique wall housings can also be used free-standing.
• Unique freestanding cabinets: 22U, 26U, 32U, 36U and 42U in the 2026 brochure (the wider comparison table also lists 47U). Widths 600 mm or 800 mm; depths include 600, 800, 1000 and 1200 mm. Example 42U Unique 800 × 1200 mm cabinet: 2053 × 800 × 1200 mm, 1200 kg rail load, IP20, levelling feet, installation depth 400–1135 mm.

Other Digitus series exist. Assmann shop listings include 18U wall cabinets (for example DN-W19 18U/600). If a bill of materials says 18U, specify the exact series and article number rather than substituting a Unique 16U or 20U without agreement.

A comms cupboard (typically 12U wall)

A 12U Unique wall cabinet is the usual starting point for a cupboard or riser that has to hold:

• one access or aggregation switch
• one 24-port patch panel (and often a brush panel)
• a small PDU or rack power strip
• cable management, leaving a little spare U for a second panel later

Check the wall's load capacity, not only the rail rating. Confirm hinge clearance, whether the door can open fully, and whether a 450 mm or 600 mm deep cabinet is needed for the chosen switch. If a UPS or a short server has to live in the same box, 12U and 450 mm are often too tight; step up in height and depth instead of forcing the parts in.

A mid-size wall cabinet (16U, 20U, or 18U in another series)

Choose this when the cupboard still cannot take a floor rack, but the list has grown: two panels, a firewall or cellular router, a small UPS, or a reserved row of U for the next project. In the current Unique wall range, that is 16U or 20U. If the site standard is already 18U, confirm whether a Digitus 18U article exists in the series you intend to buy.

At this height, power, airflow and cable entry start to matter as much as U count. Use a PDU that matches the plug and load, leave space for a roof fan where the cabinet is prepared for one, and do not block ventilation slots with cable bundles.

A 42U room (floor cabinet)

A 42U Unique floor cabinet is the usual choice for a server or comms room: heavier rail loads, greater usable depth, space for vertical cable management (on 800 mm-wide cabinets in the Unique documentation), and room for switches, panels, servers, PDUs and future growth. Pick width and depth from the equipment, not from habit — a 600 mm deep cabinet will not suit a deep server, and a 600 mm wide cabinet may be tight once vertical managers and thick copper bundles are included.

Plan:

• rail load against the real equipment weight, not a guess
• airflow: glass versus vented doors, roof fans, and blanking panels
• PDU count, phase, and whether a metered PDU is required
• patch-panel count and a documented port map
• levelling, earthing, and how the cabinet will be moved into the room

Power, panels and the rest of the bill of materials

A cabinet quote is incomplete without the passive and power parts that make it usable. Typical companions, which YOT can put on the same quote, include:

• 24-port modular patch panels and keystones (FUSE lists DN-91411-G on the Digitus hub)
• Cat6 or Cat6A patch cords sized to the cabinet depth
• a PDU matched to the feed — FUSE lists DN-95450 (1-phase 16 A) and DN-95452 (3-phase 16 A)
• shelves, blanking panels and cable management

Browse cabinets on the FUSE Digitus hub, or send the article number to sales@yotltd.com.

Where to buy

YOT LTD is a Digitus supplier in Malta. We quote cabinets, panels, copper or fibre and PDUs as one bill of materials, and can include switches or routers from other lines on the same job. See Buy Digitus in Malta, compare Digitus vs Lanberg, or email sales@yotltd.com / call +356 2732 7840. YOT LTD, C93877, 31, Triq l-Imdina, Ħ'Attard ATD9039.

Sources

• https://digitus.com/fileadmin/Kataloge_Brosch%C3%BCren/Schrank-Broschuere_EN_2026_Einzelseite.pdf
• https://digitus.com/fileadmin/Product_comparison_tables/1.Network-server-and_charging_cabinets/3-Small_Cabinets_matrix_EN.pdf
• https://digitus.com/fileadmin/Product_comparison_tables/1.Network-server-and_charging_cabinets/1-Cabinets_matrix_EN.pdf
• Unique 12U shop page (643 × 600 × 600 mm, 100 kg, IP20)
• Unique 42U 800 × 1200 mm shop page (2053 × 800 × 1200 mm, 1200 kg, IP20)