Lian Li DAN Cases B4 Micro-ATX PC Case, Black

Lian Li DAN Cases B4 Micro-ATX PC Case

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

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

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 Reviews5.0 out of 5 stars34.7 out of 5 stars5404.4 out of 5 stars84.8 out of 5 stars94.7 out of 5 stars2314.9 out of 5 stars23
Price£70.90£70.90£71.95£71.95—£65.32£65.32—£66.99£66.99
Colour(s)Black/WhiteBlack/WhiteBlack/SilverBlack/WhiteBlack/WhiteBlack
Dimensions420 × 191 × 288 mm443 × 194 × 321.5 mm326 × 140 × 244 mm419.6 × 275.1 × 395.2 mm423.6 × 273.3 × 391.95 mm436 × 221.5 × 443.9 mm
PSU supportATX up to 140 mm / SFXATX/SFX/SFX-L, up to 220 mmSFX / SFX-LATX under 182 mmATX under 200 mmATX up to 200 mm
Maximum GPU lengthup to 358 mmup to 415 mmup to 322 mmup to 410 mmup to 400 mmup to 415 mm
Expansion slotsUp to 4-slot GPU4 slots3 slots5 slots5 slots5 slots
CPU cooler clearance162mm; 168mm no side fan165 mm55 mm162 mm160 mm163.5 mm
Radiator support360mm with SFX; 240mm with ATXside:360mm; bottom: 240 mmTop: 240 mmTop: up to 360mm; side: 240mmTop: up to 360mm; side: 240mmTop: 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.
›
SKU: B0H6PW5CPC
Weight: 500 Grams
Brand: LIAN LI
Model: B4X
Colour: Black
Manufacture: Lian Li
Colour: Black
Origin: China

Product Description

Lian Li B4

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

lian li b4

  1. Black cubic portable speaker with textured fabric surface on wooden table in bright, sunlit room with geometric shadows.

    Built with DAN Cases

    Compact 21.3L mATX Chassis

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

  2. Desktop setup featuring white PC tower with cooling system and blue-tinted monitor displaying digital landscape wallpaper on wooden desk.

    Horizontal or Vertical

    Build in the Direction You Prefer

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

  3. Industrial equipment case or housing unit with dark exterior and internal blue-labeled component visible, technical storage apparatus.

    Room for Powerful GPUs

    Fit GPUs up to 358mm Long

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

  4. Black portable storage box with open compartmentalized interior showing yellow and blue storage sections, labeled with dimensions 'L70 [?] x 385mm' and 'W 545mm'.

    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. Three portable air purifier units displayed on wooden table: black unit with vertical slats, gray unit, and white unit with vertical slat design.

    Style for Any Setup

    Select Your Preferred Front Panel

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

  1. Two air purifier or similar electronic devices displayed against dark background: one with internal illuminated components visible, one white boxed unit with transparent panel.

    Air or Liquid Cooling

    Configure Cooling Around Your Hardware

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

  2. Dark interior view of computer PC case showing multiple cooling fans installed on side panel and internal cooling system architecture.

    Slim Top Exhaust Fans

    Start with Pre-Installed Airflow

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

  3. Two white modular storage organizer units with multiple compartments and grid patterns shown side-by-side against black background.

    Built for Tower Coolers

    Support for Large Air Coolers

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

  4. Dark monochromatic isometric technical illustration of computer internal components and circuit board architecture with cooling systems.

    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. Split-screen image: left side shows vivid digital artwork of abstract figures in red and gold tones; right side displays rectangular black wooden box or case with decorative carved lattice pattern.

    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.

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

  • 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.

  • 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.

  • 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.

  • 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 stars 3
4.7 out of 5 stars 540
4.4 out of 5 stars 8
4.8 out of 5 stars 9
4.7 out of 5 stars 231
4.9 out of 5 stars 23
Price
£70.90 £71.95 — £65.32 — £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

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