Overview
The Lian Li B4-mATX is a compact 21.3L small form factor PC case co-developed with DAN Cases. It fits Micro-ATX and Mini-ITX boards, graphics cards up to 358mm and 4 slots thick, and 140mm ATX or SFX power supplies, while supporting side radiators up to 360mm with an SFX PSU. The case can be used horizontally or vertically, ships with two slim top fans, and is offered in mesh or real wood front panels.
Key Highlights
- Compact 21.3L mATX case co-developed with DAN Cases
- Supports mATX / Mini-ITX boards, 358mm 4-slot GPUs, and 140mm ATX or SFX PSUs
- Up to 360mm side radiators with SFX PSU, or 240mm with ATX PSU
- 168mm max CPU cooler clearance (159mm with side fan bracket)
- Pre-installed with 2 x 120x120x15mm slim top fans and a GPU anti-sag bracket
Technical Specifications
| Brand | Lian Li |
|---|---|
| Model | Lian Li B4-mATX (Mesh) |
| Form Factor | Compact mATX (21.3L) |
| Motherboard Support | Micro-ATX / Mini-ITX |
| GPU Length Clearance | Up to 358mm (4-slot) |
| CPU Cooler Height | Up to 165mm (159mm with side fan bracket) |
| Radiator Support | Side: 360/280/240mm with SFX PSU, 240mm with ATX PSU |
| Drive Bays | 1 x 2.5" SSD (front), 1 x 3.5" HDD or 1 x 2.5" SSD (bottom) |
| Expansion Slots | Up to 4-slot GPU support |
| Front I/O | USB 3.2 Type-C x 1, USB 3.0 Type-A x 2, Audio x 1, Power button |
| Side Panel | Steel mesh (Mesh model) |
| Dimensions | 420 x 191 x 288 mm (D x W x H), 21.3L |
| Material | Steel (Mesh model); Steel + Walnut/Beech wood (Wood model) |
| Colors | Black / White |