NZXT Chassis H3 Flow (2025) M-ATX Mid-tower Case without PSU -All Black Color – CC-H31FB-01

About NZXT Chassis H3 Flow mATX Black Cabinet

The NZXT H3 Flow mATX Black Cabinet is a thoughtfully engineered micro-ATX chassis that combines space-saving design, powerful airflow capabilities, and modern build conveniences.

It’s created for builders who want a compact yet high-performance home for their gaming, creative, or productivity system.

With its elegantly understated black finish and tinted tempered glass panel, the NZXT Chassis H3 Flow mATX Black Cabinet exudes a sleek, refined look that fits seamlessly into any desktop setup or workstation environment.

At the heart of the NZXT H Flow Series Desktop Chassis is its optimized airflow architecture.

Ultra-fine mesh panels on the front, top, and sides allow cool air to penetrate deeply into the system while helping to keep airborne dust at bay.

This mesh-centric approach—paired with a ventilated PSU shroud—ensures that intake and exhaust paths remain unobstructed, enabling superior temperature control even with high-performance components.

Whether you’re outfitting powerful GPUs or relying on robust CPU air coolers or liquid loops, the NZXT Chassis H3 Flow mATX Black Cabinet delivers the airflow needed to maintain stable temperatures.

Sized Down. Powered Up. 

The NZXT Chassis H3 Flow mATX Black Cabinet redefines what is possible in a compact chassis. 

Engineered for enthusiasts who demand high performance without the bulk, this Micro-ATX case combines a space-efficient footprint with the cooling capabilities and hardware support typically reserved for larger mid-towers. 

Finished in a sleek, all-black aesthetic with tinted tempered glass, it provides a premium backdrop for your components.

Key Features:

• Unrestricted High-Airflow Design: The NZXT Chassis H3 Flow mATX Black Cabinet is built to breathe. NZXT Compact Mid Tower ATX Airflow Case features ultra-fine perforated mesh panels on the front, top, and PSU shroud to pull in massive amounts of cool air. The unique bottom-chamber layout allows intake fans to push air directly into the GPU, ensuring critical components stay cool under load.

• Next-Gen “Back-Connect” Ready: Future-proof your build with support for rear-connector motherboards (such as ASUS BTF and MSI Project Zero). This innovative standard hides connectors behind the motherboard tray, leaving the main chamber completely free of visible cables for the cleanest look possible.

• Massive Component Compatibility: Don’t compromise on power. The NZXT Chassis H3 Flow mATX Black Cabinet supports full-length graphics cards up to 377mm, allowing you to fit the latest high-end GPUs effortlessly. It also accommodates CPU air coolers up to 170mm in height and standard ATX power supplies up to 185mm.

• Superior Cooling Potential:

  • Fan Support: Mount up to 7 fans total. (Front: 2x 120/140mm, Top: 2x 120/140mm, Bottom: 2x 120mm, Rear: 1x 120mm).

  • Radiator Support: Ready for liquid cooling with support for up to a 280mm radiator in the front and a 240mm radiator on the top.

  • Includes 1x F120Q (Case Version) High-Airflow Rear Fan.

• Tool-Free & Easy to Build: Accessing your components is seamless with tool-free removal for the top, front, and side panels. Generous 31.5mm cable management clearance and integrated routing channels make organizing cables simple and stress-free.

Technical Specifications:

• Form Factor: Micro-ATX / Mini-ITX

• Dimensions: 400mm (H) x 225mm (W) x 389mm (D)

• Material: SGCC Steel, Tinted Tempered Glass

• Front I/O: 1x USB 3.2 Gen 2×2 Type-C, 1x USB 3.2 Gen 1 Type-A (Note: No 3.5mm Audio Jack)

• Drive Bays: 1x 3.5″ + 2x 2.5″

• Expansion Slots: 4

• Weight: 4.8 kg

Note: PSU not included.

Despite its micro-ATX footprint, the case offers impressive component compatibility.

Micro-ATX and Mini-ITX motherboards are fully supported, and the interior of the NZXT Black Desktop Mid Tower Chassis can accommodate full-sized graphics cards up to approximately 377 mm long (depending on your fan/radiator setup).

CPU coolers up to 170 mm tall and PSUs up to 185 mm deep fit comfortably, allowing for a wide range of hardware choices without compromising build flexibility.

With support for up to seven fans and large radiators front and top, builders can tailor cooling to their needs—whether focused on silence, airflow, or liquid-cooled performance.

The build experience has been a key focus in the design of the NZXT Chassis H3 Flow mATX Black Cabinet.

Panels detach without tools, simplifying access for both initial assembly and future upgrades or cleaning.

Thoughtful cable management features—including integrated channels and tie-down points—keep your build looking clean and organized, with minimal fuss.

This structured internal layout not only enhances airflow but also reduces installation time, making the NZXT Chassis H3 Flow mATX Black Cabinet approachable for both first-time builders and seasoned enthusiasts.

Connectivity is another strong suit.

The front I/O panel includes a USB 3.2 Type-A port and a fast USB 3.2 Gen2×2 Type-C port, ensuring compatibility with modern peripherals and high-speed devices.

Expansion options are generous for this class, with four standard PCIe slots that give you flexibility in choosing add-in cards such as GPUs, sound cards, or additional storage controllers.

A unique advantage of the NZXT Chassis H3 Flow mATX Black Cabinet is its support for back-connect motherboards like ASUS BTF and MSI Project Zero.

This modern layout enables builders to route major cables through the rear of the board, achieving a cleaner, cable-minimal look that not only enhances aesthetics but also improves airflow efficiency.

The NZXT H3 Flow mATX Black Cabinet strikes an ideal balance between compact sizing, cooling performance, buildability, and modern features.

Whether building a powerful gaming rig, a content creation workstation, or a reliable everyday PC, the NZXT Chassis H3 Flow mATX Black Cabinet offers the flexibility and thoughtful engineering to make your project both capable and visually compelling.