NZXT H2 Flow (2026) / Lian Li A3-mATX

NZXT H2 Flow (2026): CI-H21FB-01 · black; Mini-ITX case

Lian Li A3-mATX: A3-mATX steel case in black or white (A3-mATX BLACK / WHITE). The Wood Edition with a wooden front (A3-mATX-WD) and the Glass Edition with 3 mm tempered glass (A3-mATX-WDG) share the interior layout but differ in materials and dust filter arrangement; the later B4-mATX is a separate case.

SpecificationNZXT H2 Flow (2026)Lian Li A3-mATX
Release year20262024
Model year2026 NZXT—
Dimensions and volume435 × 181 × 263 mm (height × width × depth); 20.7 L NZXT—
Weight4.55 kg; empty case NZXT—
ConstructionSteel; hybrid tempered-glass and mesh side panel NZXT—
MotherboardMini-ITX; no back-connect motherboard support NZXTM-ATX and ITX; 4 expansion slots Lian Li
Power supplySFX / SFX-L; up to 130 mm long

Not designed for an ATX power supply.

NZXT		ATX / SFX / SFX-L up to 220 mm; side or front mounting

The relocatable bracket lets the power supply move to suit graphics card length; an ATX unit can also be mounted at the front on the SSD bracket.

Lian Li
Graphics card clearanceUp to 331 mm long, 65 mm thick and 150 mm wide NZXT—
Combined GPU and radiator fitFront AIO tube covers, fittings and cables can reduce available GPU width

Being shorter than 331 mm does not alone guarantee compatibility.

NZXT		—
CPU air cooler75 mm maximum height

NZXT's product guidance also calls for at least 10 mm between the cooler and glass.

NZXT		—
Front radiatorUp to 280 mm; combined radiator and fan thickness up to 60 mm NZXT—
Fan mountsFront: 2 × 120 or 2 × 140 mm; top: 2 × 120 mm NZXT—
Included fansTop: 2 × 120 mm F120Q Case Version exhaust fans; 3-pin DC

Not PWM fans or a guarantee of whole-system silence.

NZXT		—
Front connections2 × USB 3.2 Type-A; 1 × USB-C 3.2 Gen 2×2; headset jack NZXT—
Drive bays2 × 2.5-inch, up to 8.5 mm thick; no 3.5-inch bays NZXT—
Expansion and riser3 vertical slots; included 260 mm PCIe 5.0 ×16 riser

Three slots of width do not mean three separate PCIe connections.

NZXT		—
Case type and volume—MFF (Micro Form Factor); 26.3 L Lian Li
Dimensions—443 × 194 × 321.5 mm (D × W × H); 306 mm tall without feet Lian Li
Material—Steel; side and top panels in steel mesh

The Wood Edition has a wooden front panel, and the Glass Edition adds 3 mm tempered glass.

Lian Li
Graphics card—Up to 415 mm long, 4 slots thick

According to Lian Li, a 25 mm bottom fan limits card thickness to 61 mm (3 slots); a bottom radiator plus fan leaves no room for a graphics card. An anti-sag GPU bracket is included; vertical mounting needs a separately sold kit.

Lian Li
CPU cooler—Up to 165 mm tall Lian Li
Fan support—Top: 3 × 120 mm; side: 3 × 120 mm or 2 × 140 mm; bottom: 3 × 120 mm; rear: 1 × 120 mm

The case ships without fans; they must be bought separately.

Lian Li
Radiator support—Top: 360/240 mm; side: 360/280/240 mm; bottom: 240 mm (360 mm with fan at the bottom) Lian Li
Drive support—Tray: 2 × 2.5" SSD; bottom: 1 × 2.5" SSD or 1 × 3.5" HDD Lian Li
Front I/O—Power button, 2 × USB 3.0 Type-A, 1 × USB 3.1 Type-C, mic, HD audio Lian Li
Dust filter and warranty—Removable bottom dust filter; 1-year warranty Lian Li