- Accommodates full-length triple-slot graphics cards up to 13.03 in (331 mm) and 2.56 in (65 mm) thickness
- Supports up to 280 mm liquid cooling radiators within a compact 20.7-liter footprint
- Equipped with a high-bandwidth USB 3.2 Gen 2x2 Type-C front I/O port
- Includes two pre-installed F120Q 120 mm exhaust fans
- CPU cooler height clearance is strictly capped at 2.95 in (75 mm), precluding tower air coolers
- Power supply compatibility is restricted to SFX and SFX-L units only
Overview
Occupying 20.7 liters of desk footprint within a 17.1 x 7.1 x 10.4 in (435 x 181 x 263 mm) steel and tempered glass enclosure, the chassis reallocates internal chamber dimensions to prioritize high-performance graphics accommodation and dedicated liquid cooling pathways. The primary internal layout accepts Mini-ITX motherboards and extends graphics card clearance up to 13.03 in (331 mm) in length, 2.56 in (65 mm) in thickness across three expansion slots, and 5.91 in (150 mm) in width. Structural rigidity is maintained through heavy-gauge steel framing complemented by a tempered glass side panel that provides visual component inspection without flexing under load.
Thermal management relies on direct front-to-top airflow convection, supporting dual 120 mm or 140 mm front intake fans alongside front-mounted 240 mm or 280 mm radiators up to 2.36 in (60 mm) in combined thickness. NZXT equips the enclosure with two pre-installed F120Q 120 mm case-version exhaust fans to evacuate warm air through the perforated top and rear panels. Due to the lateral packaging strategy that reserves space for full-length GPUs, vertical CPU air cooler clearance is restricted to 2.95 in (75 mm), effectively directing high-thermal-output processor configurations toward closed-loop liquid cooling solutions.
Power delivery infrastructure requires an SFX or SFX-L power supply unit, freeing critical lower-chamber volume for cable routing and two internal 2.5 in drive bays. The front I/O cluster provides modern high-speed connectivity via a dedicated USB 3.2 Gen 2×2 Type-C port delivering up to 20 Gbps data transfer, accompanied by two USB 3.2 Type-A ports and a 3.5 mm combined audio headset jack. With no active electronic controllers or firmware dependencies beyond standard front-panel pass-through signaling, the hardware presents a robust, mechanically straightforward platform for high-density, small-form-factor desktop assembly.
Technical Specifications
| Brand | NZXT |
| Model | H2 Flow |
| Form Factor | Small Form Factor (SFF) Mini-ITX |
| Enclosure Volume | 20.7 L (0.73 cu ft) |
| Exterior Dimensions | 17.1 x 7.1 x 10.4 in (435 x 181 x 263 mm) |
| Weight | 10.03 lbs (4.55 kg) |
| Chassis Materials | Steel, Tempered Glass |
| Motherboard Support | Mini-ITX |
| Expansion Slots | 3 |
| Internal Drive Bays | 2x 2.5 in |
| GPU Maximum Length | 13.03 in (331 mm) |
| GPU Maximum Thickness | 2.56 in (65 mm) |
| GPU Maximum Width | 5.91 in (150 mm) |
| CPU Cooler Clearance Height | 2.95 in (75 mm) |
| Power Supply Form Factor Support | SFX, SFX-L |
| Front I/O Ports | 1x USB 3.2 Gen 2x2 Type-C, 2x USB 3.2 Type-A, 1x 3.5 mm Headset Jack |
| Pre Installed Fans | 2x F120Q (Case Version) 120 mm fans |
| Fan Mount Locations | Front: 2x 120 mm / 2x 140 mm; Top: 2x 120 mm |
| Radiator Support | Front: 240 mm / 280 mm (up to 2.36 in / 60 mm total thickness) |
| Color Options | White, Black |
Primary Sources & Audited Citations
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At a Glance
How reliable is the NZXT H2 Flow Review: Triple-Slot Clearance in 20.7 Liters according to Mizex audits?
An outstanding choice for small-form-factor builds requiring triple-slot graphics card and 280 mm liquid cooler support in a 20.7-liter footprint, provided you budget for an SFX power supply and avoid tall CPU air towers.
What are the known quirks or drawbacks of the NZXT H2 Flow Review: Triple-Slot Clearance in 20.7 Liters?
Our reliability audit identified the following documented caveats:
- CPU cooler height clearance is strictly capped at 2.95 in (75 mm), precluding tower air coolers
- Power supply compatibility is restricted to SFX and SFX-L units only
What are the key engineering highlights of the NZXT H2 Flow Review: Triple-Slot Clearance in 20.7 Liters?
The top strengths recorded in our evaluation include:
- Accommodates full-length triple-slot graphics cards up to 13.03 in (331 mm) and 2.56 in (65 mm) thickness
- Supports up to 280 mm liquid cooling radiators within a compact 20.7-liter footprint
- Equipped with a high-bandwidth USB 3.2 Gen 2x2 Type-C front I/O port
- Includes two pre-installed F120Q 120 mm exhaust fans