(PR) Lian Li Unveils B4-mATX Dual-Orientation 21.3L Chassis

LIAN LI Industrial Co. Ltd., a leading provider of PC cases, cooling, and power supplies, announces the B4-mATX, a 21.3-liter small form factor chassis co-developed with DAN Cases. Designed to deliver strong hardware compatibility in a compact layout, the B4-mATX supports microATX motherboards, GPUs up to 358 mm, and both ATX and SFX power supplies. The chassis can be positioned horizontally as a desktop unit or rotated 90 degrees into a vertical tower that occupies 30% less desk space. With multiple front-panel finishes, mesh or real wood, in black or white, the B4-mATX suits both performance and lifestyle builds.

One Chassis—Two Orientations
When placed horizontally, the B4-mATX sits as a compact desktop unit. When rotated to a vertical orientation, it occupies 30% less desk space. A rotatable AC inlet adapts to both layouts—rotated outward for easier cable access, or inward in vertical mode to absorb excess cable length inside the chassis. A swiveling cable bracket below the PCIe slots keeps rear I/O and power cables flush against the case in vertical mode, with total clearance including connectors up to 52 mm tall. Front-panel options include perforated mesh for direct intake or a real wood finish (walnut or beech) for lifestyle aesthetics, with both finishes available in black or white.

[Editor’s note: Our in-depth review of the Lian Li B4-mATX is now live]