Lian Li DAN Cases B4 Micro-ATX PC Case, Black Black, 21.3L SFF chassis, 358mm 4-slot GPU support, ATX/SFX PSU, 360mm AIO with SFX PSU, 2x 120mm fans

Lian Li B4

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lian li b4

1. Built with DAN Cases

   Compact 21.3L mATX Chassis

   Space-conscious 21.3L chassis designed for Micro-ATX and Mini-ITX systems.

2. Horizontal or Vertical

   Build in the Direction You Prefer

   Use horizontally or rotate vertically to reduce the case footprint by 30%.

3. Room for Powerful GPUs

   Fit GPUs up to 358mm Long

   Install graphics cards up to 358mm long across four expansion slots.

4. ATX or SFX Compatible

   Choose the PSU Format for Your Build

   Dedicated brackets support SFX units or ATX power supplies up to 140mm long.

5. Style for Any Setup

   Select Your Preferred Front Panel

   Choose mesh or a real wood front panel in black or white.

1 Compact Design 2 Two Orientations 3 Full-Size GPU Support 4 Flexible PSU Options 5 Mesh or Real Wood

1. Air or Liquid Cooling

   Configure Cooling Around Your Hardware

   Support for side radiators reaches 360mm with SFX PSUs or 240mm with ATX PSUs.

2. Slim Top Exhaust Fans

   Start with Pre-Installed Airflow

   Two 120mm slim fans are pre-installed on a removable top bracket.

3. Built for Tower Coolers

   Support for Large Air Coolers

   Fit CPU coolers up to 162mm, or 168mm with the side fan bracket removed.

4. Secure Your Components

   Built-In GPU Support and Storage

   An adjustable anti-sag bracket supports the GPU, with mounts for up to two drives.

5. Extra GPU-Focused Airflow

   Expand Cooling in Vertical Mode

   The optional Vertical AeroDeck adds direct GPU airflow and support for up to three 120mm fans.

1 Flexible Cooling 2 Two Fans Included 3 CPU Cooler Clearance 4 Storage and Support 5 Optional AeroDeck

• Which motherboards fit in the Lian Li DAN Cases B4?

  The case is designed for motherboards up to Micro-ATX, providing a compact foundation for high-performance SFF builds.

• How long can the graphics card be?

  It supports graphics cards up to 358 mm long. You should still check the dimensions of your GPU and your chosen power supply and cooling configuration before installation.

• Can I use an ATX power supply?

  Yes. ATX power supplies up to 140 mm long are supported. Alternatively, you can use an SFX power supply to gain more flexibility for cooling.

• Which fans are already installed?

  Two addressable 120 mm fans are pre-installed as standard. Depending on your build, you can also install additional 120 mm fans at the bottom and front.

• Can the case be used vertically and horizontally?

  Yes. The B4 can be positioned upright or on its side. The rotatable AC connector makes cable routing easier in either orientation.

Compare Lian Li Cases: See How the B4 mATX Stacks Up

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Customer Reviews	5.0 out of 5 stars3	4.7 out of 5 stars540	4.4 out of 5 stars8	4.8 out of 5 stars9	4.7 out of 5 stars231	4.9 out of 5 stars23
Price	£70.90£70.90	£71.95£71.95	—	£65.32£65.32	—	£66.99£66.99
Colour(s)	Black/White	Black/White	Black/Silver	Black/White	Black/White	Black
Dimensions	420 × 191 × 288 mm	443 × 194 × 321.5 mm	326 × 140 × 244 mm	419.6 × 275.1 × 395.2 mm	423.6 × 273.3 × 391.95 mm	436 × 221.5 × 443.9 mm
PSU support	ATX up to 140 mm / SFX	ATX/SFX/SFX-L, up to 220 mm	SFX / SFX-L	ATX under 182 mm	ATX under 200 mm	ATX up to 200 mm
Maximum GPU length	up to 358 mm	up to 415 mm	up to 322 mm	up to 410 mm	up to 400 mm	up to 415 mm
Expansion slots	Up to 4-slot GPU	4 slots	3 slots	5 slots	5 slots	5 slots
CPU cooler clearance	162mm; 168mm no side fan	165 mm	55 mm	162 mm	160 mm	163.5 mm
Radiator support	360mm with SFX; 240mm with ATX	side:360mm; bottom: 240 mm	Top: 240 mm	Top: up to 360mm; side: 240mm	Top: up to 360mm; side: 240mm	Top: up to 360 mm

• PERFORMANCE IN A SMALL FOOTPRINT: The Lian Li DAN Cases B4 Micro-ATX case offers a volume of 21.3 L and space for high-performance hardware in a compact setup.
• MORE ROOM FOR YOUR GPU: Supports graphics cards up to 358 mm long and CPU air coolers up to 166.5 mm high for flexible gaming and workstation builds.
• FLEXIBLE PSU OPTIONS: Use ATX power supplies up to 140 mm long or SFX power supplies and configure the interior to suit your cooling and hardware setup.
• AIRFLOW-FRIENDLY DESIGN: Mesh panels and two pre-installed addressable 120 mm fans support air circulation within the compact case.
• SUITS YOUR SETUP: The black steel case can be positioned vertically or horizontally and fits neatly into desktop or living-room setups.

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