PC cases · 2026 · NZXT

NZXT H2 Flow (2026)

A vertical 20.7-litre case with a small desk footprint. Two top fans and a PCIe 5.0 riser are included; the motherboard, PSU and cooler are selected separately. GPU thickness and width, as well as radiator tubing, matter just as much as card length when planning the build.

CI-H21FB-01 · black; Mini-ITX case

NZXT H2 Flow (2026) — Black NZXT H2 Flow CI-H21FB-01, with no PC components installed; front and glass/mesh side view.
Black NZXT H2 Flow CI-H21FB-01, with no PC components installed; front and glass/mesh side view.

Specifications

SpecificationValue
Model year2026
Dimensions and volume435 × 181 × 263 mm (height × width × depth); 20.7 L
Weight4.55 kg; empty case
ConstructionSteel; hybrid tempered-glass and mesh side panel
MotherboardMini-ITX; no back-connect motherboard support
Power supplySFX / SFX-L; up to 130 mm long

Not designed for an ATX power supply.

Graphics card clearanceUp to 331 mm long, 65 mm thick and 150 mm wide
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.

CPU air cooler75 mm maximum height

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

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

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

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

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

From the manufacturer

NZXT emphasizes tool-less panels and the small footprint. Its 26 February 2026 riser statement describes ground-only layers around mounting holes, production board design and its own destructive tests. This is the brand's engineering statement, not independent safety certification or evidence that the H1 recall applies to H2. NZXT

Strengths and limitations

  • OC3D likes the small footprint and cable tie points, but finds bottom-routed radiator tubing cramped around the graphics card. It also wants more space behind flow-through GPU coolers.

    Build review using an NZXT-supplied case and PSU, 17 February 2026. Not a measured thermal result for every graphics card.

    OC3D: NZXT H2 Flow Mini-ITX case review

  • Guru3D’s Hilbert Hagedoorn sees thermal performance as the case’s strongest point: the mesh-heavy panels, defined airflow paths and vertical GPU layout make the separate CPU and GPU airflow zones particularly effective. The open design lets more sound out than closed cases, so noise-sensitive users need to tune their fans. Pre-routed cables and the pre-fitted PCIe riser make building easier, while storage options are limited.

    Hilbert Hagedoorn’s single-sample review; the final page gives no numerical temperature or noise figures.

    Guru3D: NZXT H2 Flow (2026) review, final words

Owner experiences and issues

  • Opposite_Ad_2872 is happy with noise after assembly, but found GPU-to-riser alignment and cable routing difficult. NESK4u also reports a positive experience after about three months. These builds use different fans and coolers.

    Ownership claims without purchase or incentive verification. Modified builds do not establish that every standard component combination will fit.

    Reddit: H2 Flow owners' build experiences

  • GummyGripper reports hum and vibration with replacement fans, saying the noise decreases when a fan is moved away from the grille. This differs from the satisfied owner in the other thread; it does not establish a shared fault in the included F120Q fans.

    Fan type, speed and mounting differ. IVANZXT directs the owner to support; that reply is not an admission of a common design defect.

    Reddit: GummyGripper's H2 Flow fan noise thread

Tags

Mesh2026

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Sources

  1. NZXT: H2 Flow specifications and compatibility FAQ
  2. NZXT: H2 Flow assembly manual, V6
  3. NZXT: H2 Flow riser card engineering and safety statement
  4. OC3D: NZXT H2 Flow Mini-ITX case review
  5. Reddit: H2 Flow owners' build experiences
  6. Reddit: GummyGripper's H2 Flow fan noise thread
  7. Guru3D: NZXT H2 Flow (2026) review, final words