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Co-developed with DAN Cases, the B4-mATX’s modular design unlocks versatile build possibilities. With multiple color, panel, and layout options, plus an optional accessory, it adapts to a wide range of styles.
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B4-mATX Wood Black B4-mATX Mesh White |
B4-mATX Mesh Black (Vertical) B4-mATX Wood White (Vertical) |
B4-mATX Wood + Vertical AeroDeck Black B4-mATX Mesh + Vertical AeroDeck Black |
With a compact 21.3L volume, the B4-mATX delivers impressive hardware compatibility, supporting M-ATX motherboards, 360mm AIOs, 140mm ATX PSUs, and up to 358mm 4-slot GPUs.
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Minimal Design,Multiple StylesThe B4-mATX offers a clean mesh panel for an airflow-focused look or a real wood panel for a warmer, refined setup. Both support front-to-back airflow, balancing cooling performance with a streamlined exterior. |
Vertical Mode,Maximized Desk SpaceThe vertical layout improves desk space efficiency by up to 30%. Integrated rear feet allow quick and easy switching between different usage modes. Note: In vertical mode, the rear clearance for the connector and cable routing is 52mm in total. Please ensure your HDMI / DP cable fits within this space. |
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The rear fan bracket features a reversible design for greater layout flexibility. It can be installed outward to create more clearance for liquid cooling, or inward to position the fan closer to the CPU airflow path and improve CPU air-cooling performance by up to 1°C.
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Note: The rear fan bracket supports standard 120mm fans only.
The B4-mATX supports 360mm and 280mm radiators with up to 52mm total thickness.
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360 / 280mm AIO Setup
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240mm AIO Setup
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Note: Due to internal space limitations, fans must be installed outwards when using liquid cooling.
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240mm AIO Installation Setup:
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280mm AIO Installation Setup:
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162mm Air Cooler Setup
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168mm Air Cooler Setup
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Top: 2 × 120mm slim fans (pre-installed)
Side: 3 × 120mm fans / 2 × 140mm fans or 360mm / 280mm / 240mm radiator
Rear: 1 × 120mm fan
Bottom: 3 × 120mm fans / 2 × 140mm fans
Front: 1 × 120mm slim fan
(Note: The front slim fan is not supported with 360mm radiator or ATX PSU installation.)
Note: To install three 120mm fans, the PCIe accessory below the PCIe slots must be removed.
Extra Intake, Better CoolingSupports a 120 × 120 × 15mm slim front fan with an SFX PSU and GPU under 343mm long, helping improve intake airflow. |
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PRE-INSTALLED 15MM SLIM FANS,Flexible Airflow Design Two pre-installed 120 × 120 × 15mm slim fans on the top provide enhanced cooling performance. Operating up to 1800 RPM, they are daisy-chained to reduce cable clutter.  |
Flexible GPU & Fan SupportSupports up to 358mm long 4-slot graphics cards. Bottom fan support varies by GPU thickness: 2.5-slot GPUs support 25mm fans, 3-slot GPUs support 15mm slim fans, and 3.5-slot or thicker GPUs do not support bottom fans. |
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Easy GPU InstallationThe removable front fan bracket lets large graphics cards slide in from the front side of the chassis for a smoother installation process. |
Pre-Installed
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Tool-less removable panels offer quick and easy access for installation and cable routing, while a removable bottom dust filter helps maintain a clean system.
The removable top fan bracket provides easier access for routing and managing CPU 8-pin cables, while also making it simpler to configure the front-top fan as intake for air-cooler setups.
Cable tie points around the PSU and top brackets help secure CPU 8-pin and PSU cables for a cleaner, more organized build.
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In vertical mode, a removable bracket and rotatable cable guide work together to route cables cleanly through the bottom of the case. Note: 52mm of total desk clearance is recommended for standard HDMI / DP cable routing. Longer connectors may require an adapter. |
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In vertical layout, the Vertical AeroDeck enhances GPU cooling while maintaining a cohesive look with the case. It supports up to three 120mm or two 140mm fans, includes a PVC dust filter, and features tempered glass side panels to showcase fan side-frame lighting.
Note: Installation requires repositioning the I/O module.
Supports 1 x 2.5” SSD at the front, with space at the bottom for either 1 x 2.5” SSD or 1 x 3.5” HDD.
Note: Installing a 3.5″ HDD on the bottom limits GPU thickness to 65mm and allows for only one 120mm bottom fan. With a 2.5″ SSD installed, two 120mm bottom fans can be supported.
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ACCESSIBLE CONNECTIVITYThe I/O layout keeps essential ports easy to reach in both traditional and vertical layouts, with a high-speed USB Type-C port supporting up to 20Gbps transfer speeds. |
In Collaboration with DAN CasesCo-developed with Daniel Hansen of DAN Cases, the B4-mATX combines flexible modularity with LIAN LI’s precision craftsmanship in a compact form. |
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Tool-less removable panels offer quick and easy access for installation and cable routing, while a removable bottom dust filter helps maintain a clean system.
Note: When installing a 15mm-thick slim front fan, the maximum GPU length is limited to 343mm. The total thickness of the radiator and fan must not exceed 52mm.
| SPECIFICATIONS | |
| PRODUCT NAME | B4-mATX Mesh |
| MODEL NO. | B4W |
| COLOR | Black |
| DIMENSIONS (DxWxH) | 420 x 191 x 288mm |
| MATERIAL | Steel |
| MOTHERBOARD SUPPORT | Back-Connect: NO / Micro-ATX, Mini ITX |
| STORAGE | Front: 2.5” SSD x 1 Bottom: 3.5” HDD x 1 or 2.5” SSD x 1 |
| GPU LENGTH CLEARANCE | 358mm |
| CPU COOLER HEIGHT CLEARANCE |
162mm (168mm without side fan bracket) |
| PSU SUPPORT | ATX (Up to 140mm) / SFX |
| RADIATOR SUPPORT | Side (With SFX PSU) 360mm / 280mm /240mm Side (With ATX PSU): 240mm |
| FAN SUPPORT | Top: 120mm x 2 (Pre-installed) Side (With SFX PSU) 120mm x 3 / 140mm x 2 Side (With ATX PSU): 120mm x 2 Front (With SFX PSU ONLY): 120mm slim fan x 1 Bottom: 120 mm x 3 / 140mm x 2 Rear: 120 mm x 1 |
| INCLUDED FANS | Top: 120x120x15mm (x2) |
| DUST FILTER | Bottom: Magnetic Filter x 1 |
| I/O PORTS | USB 3.0 Type A x 2 Power Button x 1 Audio x 1 USB 3.2 Type C x 1 |
| WARRANTY | 1-Year |
