Lian Li B4 Mesh Black Micro-ATX Gaming PC Case High Airflow Tower B4X

Lian Li B4 Mesh Black Case

A compact mATX PC case designed with LIAN LI and DAN Cases collaboration

The Mesh Black version uses a clean black chassis with an airflow-focused mesh front panel

Compact 21.3L Design

The B4-mATX is built for compact desktop systems without giving up broad hardware support

Its 21.3L volume keeps the build practical for desks, workstations and clean home setups

The case can be used in horizontal or vertical orientation depending on the setup

Mesh Black Style

The mesh front panel gives the case an airflow-focused look for modern PC builds

The black finish keeps the system neutral and easy to match with different components

The front-to-back airflow layout is designed to balance cooling and a streamlined exterior

mATX Hardware Support

The case supports Micro-ATX motherboards for compact but capable PC builds

It supports up to 358mm 4-slot graphics cards for powerful desktop configurations

The layout also supports ATX power supplies up to 140mm

Front I/O Panel

The top I/O panel provides quick access to everyday ports

It includes 2 USB 3.0 Type-A ports, 1 USB 3.2 Type-C port and 1 audio jack

Cooling Options

The B4-mATX supports up to 360mm AIO cooling

Two slim 120mm fans are pre-installed for the case airflow layout

The chassis supports additional fan configurations for more flexible cooling setups

Storage Support

The case supports compact storage layouts for SSD and HDD installation

It can fit up to 2 x 2.5″ SSD or 1 x 2.5″ SSD with 1 x 3.5″ HDD

Modular Design

Tool-less removable panels provide quick access during installation and cable routing

The modular layout makes the build process easier to manage in a compact case

A removable bottom dust filter helps keep the system cleaner during everyday use