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Lian Li B4-mATX Mesh Mini Tower Black
Available for delivery from Wednesday 11th November
Click & Collect from Wednesday 11th November
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Co-developed with DAN Cases, the Lian Li B4-mATX Mesh in Black delivers high-performance cooling and broad component support within a compact 21.3-litre footprint. Featuring fine steel mesh panels and a sleek, stealthy all-black finish, it provides direct airflow alongside a understated, industrial aesthetic for Micro-ATX and Mini-ITX builds.
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Airflow-Optimised Mesh Construction
Encased in fine steel mesh side and front panels, the chassis provides continuous ventilation to keep high-end components cool under load. The dark, monochrome finish offers a subtle industrial foundation for stealthy or RGB-lit custom builds, while tool-less panel removal makes hardware upgrades and routine maintenance quick and straightforward.
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Versatile Dual-Orientation Layout
The chassis adapts easily to your workspace by supporting both traditional horizontal and space-saving vertical configurations. Rotating the case vertically reduces its desk footprint by up to 30%, supported by integrated rear feet, a rotatable AC power inlet, and a low-profile routing system with 52mm of cable clearance.
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Extensive Cooling Capabilities
Out of the box, the case includes two pre-installed 120mm slim black fans at the top and supports up to 9 fans in total across the frame. For liquid cooling setups, the side bracket accommodates 240mm, 280mm, or 360mm radiators up to 52mm thick, while air coolers up to 165mm tall fit with ease.
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Full-Sized Graphics Card Support
Engineered to accommodate modern GPUs, the interior fits 4-slot cards up to 358mm in length. A pre-installed anti-sag bracket prevents card droop over time, and a removable front frame bracket allows large graphics cards to slide smoothly into position during assembly.
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Flexible Hardware and Connectivity
The layout supports Micro-ATX or Mini-ITX motherboards along with standard ATX power supplies up to 140mm or compact SFX units. Front I/O access remains effortless in both orientations, offering a high-speed USB 3.2 Type-C port (20Gbps), two USB 3.0 Type-A ports, and a combined HD audio jack.
User Controls
- User Controls: Power Button
Interfaces/Ports
- Audio Line Out Ports: 1 (Shared 3.5mm jack)
Electrical
- Line Frequency: Micro-ATX (21.3L Small Form Factor)
Interfaces/Ports
- Microphone In Port: 1 (Shared 3.5mm jack)
Storage
- Internal Expansion Bays: 2 (Supports 1ž 2.5" SSD front + 1ž hybrid 3.5" HDD / 2.5" SSD bottom)
Expansion
- Expansion Slots: 4
Interfaces/Ports
- USB Ports: 3 (2ž USB 3.0 Type-A, 1ž USB 3.2 Type-C)
- Audio Line In Ports: 1 (Shared 3.5mm combo jack)
- Audio Line Out Ports: 1 (Shared 3.5mm combo jack)
- Headphone Ports: 1 (3.5mm combo jack)
- Microphone In Port: 1 (3.5mm combo jack)
Electrical
- Cooling System: Supports up to a 360mm side radiator (requires SFX/SFX-L PSU and max 52mm combined radiator/fan thickness
- Power Supply: Standard ATX (up to 140mm) / SFX / SFX-L (Not included)
Environmental
- Operating Temperature: Standard PC operating conditions (N/A)
- Operating Humidity: Standard PC operating conditions (N/A)
Physical
- Form Factor: Micro-ATX
Warranty
- Warranty: 1 Year
Physical
- Case Colour: Black
- Material: Steel, Mesh
- LED Status Indicators: Power LED
- Motherboard Compatibility: Micro-ATX, Mini-ITX
- In The Box: Case, 2ž 120mm slim PWM fans (top pre-installed), accessory box (screws/standoffs, internal AC extension cable, user manual)
- Width: 191 mm
- Depth: 420 mm
- Height: 288 mm
- Weight: ~5.8 kg
Identifiers
- Stock Code: CAS5954
- Mfg Code: G99.B4X.00
Warranty
- Warranty: 1 Year
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