Lian Li Industrial Co. Ltd. launches the B4‑mATX, a 21.3‑liter chassis that flips between horizontal desktop and vertical tower. The design cuts desk space by 30 % in tower mode, while still fitting microATX boards, 358‑mm GPUs, and both ATX and SFX power supplies.

The case ships with two 120‑mm fans and supports side radiators up to 360 mm with an SFX PSU or 240 mm with a 140‑mm ATX PSU. A swiveling cable bracket keeps rear I/O flush, and a 52‑mm tall connector clearance accommodates large CPU coolers.

Front panels appear in mesh or walnut/beech wood, available in black or white, letting users balance airflow or aesthetics. An optional Aero Deck expands fan capacity and adds a glass side panel for display.

Priced at $69.99 for the mesh black variant, the B4‑mATX debuts on June 26, 2026, offering a versatile, space‑saving solution for performance‑oriented and lifestyle PCs alike.