Lian Li DAN Cases B4 PC Case, Micro-ATX - Black

The Lian Li x DAN Case B4 Micro-ATX is a compact SFF case designed for Micro-ATX hardware in a small footprint. With a volume of 21.3 liters, the case remains space-saving while offering room for large graphics cards, CPU coolers up to 166.5 mm in height, and flexible power supply configurations. The black mesh design is optimized for airflow and works in both vertical and horizontal orientations.

–  21.3-liter SFF case: Compact format with Micro-ATX support
– Room for the GPU: Graphics cards up to 358 mm supported
– Flexible PSU mounting: Supports both ATX and SFX power supplies
– Cooling ready: Two addressable 120 mm fans pre-installed
– Positioning as desired: Usable vertically or horizontally

Lian Li x DAN B4 Mesh Black: Micro-ATX in a compact 21.3-liter format
Lian Li x DAN B4 Mesh Black
The B4 Mesh is designed for high-performance hardware in a small form factor. You can install a Micro-ATX motherboard and fit graphics cards up to 358 mm in length. There’s also room for CPU cooling: air coolers can be up to 166.5 mm tall.

ATX and SFX PSUs: More freedom in power supply choice
B4 Mesh Black power supply area
For power delivery, mounting options are available for ATX and SFX power supplies. If you choose to install an ATX PSU, models up to 140 mm in length are supported. Depending on your PSU choice, the available space for cooling changes — especially important if you plan to install a radiator.

The rotatable AC power connector makes cable management easier in both case orientations. When lying flat, the connector faces outward. When standing, you can rotate it inward so excess cable length is concealed inside the case.

For vertical and horizontal setups
You can position the case horizontally or vertically. If you want to optimize the vertical setup further, the separately available Lian Li Vertical AeroDeck can be added. This expands the maximum fan capacity and directs air straight to the graphics card.

–  Cooling in the Lian Li DAN Cases B4: Mesh panels and flexible fan mounting
– 2x 120mm fans pre-installed
– Front fan mounted on a removable bracket
– Radiator support up to 360 mm with SFX PSU or 140 mm with ATX PSU

The mesh supports airflow within the case. Two 120mm fans come installed from the factory. Additionally, you can mount 120 mm fans at the bottom and front of the case. The front fan sits on a removable bracket, allowing easier access to the interior and the ability to customize cooling to your setup.

Radiator support depending on your PSU choice
For water cooling, the B4 offers two different options. With an SFX power supply, you can easily install a 360mm radiator. Using an ATX power supply allows for a 140mm radiator. This lets you decide whether you prefer more radiator space or a classic ATX PSU configuration.

Mesh edition: airflow and sturdy steel structure
B4 Mesh Black case construction
The mesh design ensures the B4 case is optimized for airflow — whether you use it lying flat or standing upright. The internal steel structure supports and protects your hardware, while the minimalist exterior gives your build a clean, understated look.