Co-developed with DAN Cases: a 21.3L dual-orientation micro-ATX chassis with perforated mesh panels for direct airflow.
SKU: G99.B4X.00
Colour · Black
The B4-mATX Mesh is Lian Li's compact dual-orientation chassis, co-developed with Daniel Hansen of DAN Cases. It fits a micro-ATX motherboard, a 4-slot graphics card up to 358 mm long and a 140 mm ATX or SFX power supply inside a tidy 21.3-litre steel body that can lie flat as a desktop unit or stand upright to take up 30% less desk space.
This Mesh Edition dresses the case in perforated steel panels for direct, front-to-back airflow. Two 120 x 120 x 15 mm slim fans come pre-installed on a removable top bracket, and the case takes up to 9 fans in total, plus a side-mounted radiator up to 360 mm with an SFX PSU (240 mm with an ATX PSU). A reversible rear fan bracket, a rotatable AC inlet and a removable front bracket make building in such a small space far easier.
A pre-installed anti-sag bracket keeps heavy cards level, a magnetic bottom filter keeps dust out, and the front I/O pairs a 20Gbps USB Type-C port with two USB 3.0 ports that stay easy to reach in either orientation.
| Spec | Value |
|---|---|
| Form Factor | Micro-ATX |
| Motherboard Support | Micro-ATX / Mini-ITX (no back-connect) |
| Model | B4X (Black) / B4W (White) |
| Front Panel | Perforated steel mesh |
| Material | Steel |
| Volume | 21.3 Litres |
| Dimensions | 420 x 191 x 288 mm (D x W x H) |
| Orientation | Horizontal or vertical (dual-orientation) |
| GPU Clearance | Up to 358 mm (4-slot) |
| CPU Cooler Clearance | 159 mm (165 mm without side fan bracket) |
| PSU Support | ATX (up to 140 mm) / SFX |
| Radiator Support | Side: 360 / 280 / 240 mm with SFX PSU, 240 mm with ATX PSU (max 52 mm radiator + fan) |
| Fan Support | Top 2x 120 mm (pre-installed), side 3x 120 mm / 2x 140 mm (SFX PSU) or 2x 120 mm (ATX PSU), bottom 3x 120 mm / 2x 140 mm, rear 1x 120 mm, front 1x 120 mm slim (SFX PSU only); up to 9 fans |
| Included Fans | 2x 120 x 120 x 15 mm slim fans (top, non-RGB, up to 1800 rpm, daisy-chained) |
| Storage | Front: 1x 2.5" SSD; bottom: 1x 3.5" HDD or 1x 2.5" SSD |
| Dust Filter | Bottom magnetic filter |
| Front I/O | 2x USB 3.0 Type-A, 1x USB 3.2 Type-C (up to 20Gbps), audio, power button |
| GPU Bracket | Pre-installed anti-sag bracket |
| Colours | Black, White |
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