The Lian Li x DAN Case B4 Micro-ATX offers extensive hardware support in a compact 21.3-liter format. It is ideal for builds requiring little space but that don't want to be typical mini-PC solutions. A Micro-ATX motherboard, long graphics card, ATX or SFX power supply, and flexible cooling options fit into a case that can be positioned vertically or horizontally. The Wooden Edition combines aluminum mesh panels with a front made of genuine walnut wood.

-  Compact SFF format: 21.3 liters volume with Micro-ATX support
- Plenty of space for GPUs: Graphics cards up to 358 mm supported
- Flexible PSU choice: Dedicated mounts for ATX and SFX power supplies
- Airflow layout: Two addressable 120 mm fans pre-installed
- Versatile positioning: Usable horizontally or vertically

Lian Li x DAN B4 Micro-ATX Case: 21.3 liters volume with extensive hardware support
Lian Li x DAN B4 Wooden Edition
The Lian Li x DAN B4 uses its 21.3-liter volume efficiently. It supports Micro-ATX motherboards, graphics cards up to 358 mm in length, and CPU coolers up to 166.5 mm in height. This makes the case suitable for compact gaming and workstation systems that require more than basic hardware.

ATX or SFX: Power supply choice tailored to cooling
Power supply mounts in the B4
Depending on your cooling configuration, you can install an ATX power supply up to 140 mm or an SFX power supply. Separate mounts are provided for both options, allowing you to optimize the case either for maximum compatibility or for more space for water cooling.

The power connection is prepared for different case orientations. The rotatable AC connector simplifies cable management: in horizontal use, it faces outward; in vertical use, excess cable length can be stored inside the case.

Position vertically or horizontally
The B4 can be used vertically or horizontally depending on your workspace and setup. For vertical orientation, you can add the separately available Lian Li Vertical AeroDeck. It expands fan capacity and creates a direct airflow path to the graphics card.

-  Cooling in the Lian Li x DAN B4: Flexible planning for air and water cooling
- 2x 120mm fans pre-installed
- Front fan can be used as intake when combined with air coolers
- Radiator support up to 360 mm with SFX power supply or up to 140 mm with ATX power supply

The B4 offers multiple options for air and water cooling. Two 120mm fans are already installed. Additionally, you can install 120mm fans at the bottom and front. The front fan is mounted on a removable bracket and can be oriented as intake when using an air cooler.

Radiator support depending on power supply configuration
For water cooling, available space depends on the power supply choice. With an SFX power supply, you can install a 360mm radiator. With an ATX power supply, a 140 mm radiator is possible. This allows you to tailor the case for air cooling, compact AiO solutions, or more radiator surface area.

Black Walnut Edition: Mesh, steel frame, and genuine walnut wood
B4 Black Walnut material mix
The combination of mesh, steel, and walnut wood creates a premium appearance without compromising function. The B4 m-ATX remains focused on airflow and optimal cooling of your hardware in both orientations—whether lying flat or standing on your desk.

Specifications

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