The NZXT H3 Flow, a white micro-ATX case with mesh front panel, side ventilation, and a visible rear cooling fan for high airflow, is displayed at an angle on a white background.

The NZXT H3 Flow micro-ATX case in white is shown, measuring 389 mm tall, 225 mm wide, and 400 mm deep. It features mesh panels and fans for high-airflow cooling.

The NZXT H3 Flow is a white micro-ATX case supporting Mini-ITX and Micro-ATX motherboards, offering a compact, space-saving design with high airflow for optimal cooling—ideal for small spaces without sacrificing performance.

The NZXT H3 Flow micro-ATX case displays a full-size GPU, highlighting support for cards up to 377mm and compatibility with 50 series GPUs. Details on GPU length and enhanced cooling support are featured below the highlighted area.

The NZXT H3 Flow micro-ATX case offers spacious cooling with support for up to a 280mm front radiator, 240mm top radiator, and up to 7 fans, providing comprehensive airflow for superior performance.

The NZXT H3 Flow micro-ATX case features blue intake and purple exhaust arrows, showcasing its high-airflow design with ultra-fine mesh on the front and PSU shroud to maximize air intake and minimize dust buildup.

The NZXT H3 Flow is a micro-ATX case featuring marked motherboard mounting zones and back-connect support, ensuring compatibility with ASUS BTF and MSI Project Zero for a clean, cable-free build and improved cooling.

The NZXT H3 Flow is a white micro-ATX case with removable side, top, and front panels, revealing cable channels and tie-down points. BUILDER-FRIENDLY DESIGN—tool-free access and high-airflow features make building easy.

The NZXT H3 Flow is a white micro-ATX case with a pre-installed F120Q (CV) 3-pin DC rear fan for exhaust. Its high-airflow design ensures excellent cooling support right out of the box.

The NZXT H3 Flow is a black micro-ATX case with a mesh front panel, side vents, and a pre-installed rear fan. Shown angled to display its spacious interior and high-airflow design.

The NZXT H3 Flow is a black micro-ATX case with a high-airflow design, measuring 389 x 225 x 400 mm. It offers space efficiency, supports large components, and ensures excellent cooling.

The NZXT H3 Flow is a micro-ATX case compatible with Mini-ITX and Micro-ATX motherboards, featuring a space-saving, high-airflow design for optimal performance in compact areas.

The NZXT H3 Flow micro-ATX case supports GPUs up to 377 mm (no front fans), 352 mm (with fans), or 317 mm (fans with radiator). Enhanced cooling ensures your components run smoothly.

A diagram of the NZXT H3 Flow micro-ATX case shows labeled mounts for up to a 280mm front radiator, 240mm top radiator, and support for up to 7 fans.

The NZXT H3 Flow micro-ATX case features a high-airflow design, with cool air entering from the front and bottom and warm air exiting from the top and rear, optimizing cooling support and reducing dust buildup.

NZXT H3 Flow micro-ATX case highlights support for back-connect motherboards (ASUS BTF, MSI Project Zero) for a clean, cable-free look and high airflow. Text below: BACK-CONNECT SUPPORT.

H3 Flow

New

Micro-ATX Airflow Case

$79.99

Color:White

Variant

Inside the Box

H3 Flow x 1
Pre-installed F120Q (CV) x 1
Installation accessories x 1
User guide x 1

Warranty & Return Policy

NZXT.com Store Returns/Exchange Policy

Eligible products qualify for a refund or exchange only with an authorized RMA number and the item is returned to the NZXT.com Store inventory within 30 days of purchase. Returns are not allowed beyond 30 days of the purchase date.

The NZXT.com Store reserves the right to deny any return or exchange. Refunds will be credited to the original method of payment. To initiate a return, simply submit a request.

Warranty Length

New NZXT computer cases, temperature meters, fans, lighting, monitors, accessories, and cables carry a 2-year warranty from the date of purchase for parts and labor.
NZXT peripherals including keyboard, mouse, mouse pad, capture card, microphone (Capsule series) , and the audio products (Relay Headset, Relay Subwoofer, Relay Speakers, and SwitchMix) carry a 2-year warranty.
NZXT Gold power supplies carry a 10-year warranty and the Bronze power supplies carry a 5-year warranty.
NZXT Kraken X and Kraken Z Series liquid coolers carry a 6-year warranty and the Kraken M22 and Kraken 120 carry a 3-year warranty.
NZXT motherboards carry a 3-year warranty, excluding the N7 Z370 and N7 Z390 which carry a 4-year extended warranty.
All NZXT Certified Refurbished NZXT brand products carry a 1-year warranty from the date of purchase for parts and labor. Any replacement product will be warranted for the remainder of the warranty period or thirty days, whichever is longer. Proof of purchase is required for warranty service.

Resources

Manuals & Documentation

H3 Flow

$79.99

Overview

The H3 Flow micro-ATX case combines a space-efficient design with high-performance capability. Designed to support full-sized components, it features ultra-fine mesh panels and a ventilated PSU shroud to maintain consistent, optimized airflow throughout your build.

Space-Saving Size: A space-efficient micro-ATX chassis that accommodates high-performance components without compromise.
High-Airflow Design: Ultra-fine steel mesh panels and a ventilated PSU shroud maximize airflow while effectively filtering out dust.
Extensive Cooling Support: Supports up to a 280 mm radiator in the front, a 240 mm radiator on top, and up to seven fans for powerful, customizable cooling performance.
Full-Size GPU Support: Fits graphics cards up to 377 mm (without front fans), 352 mm (with front fans), or 317 mm (with front radiator and fans installed).
Pre-Installed Rear Fan: Includes one F120Q (CV) fan at the rear to provide efficient exhaust airflow straight out of the box. CV = Case Version (3-pin DC)
Simplified Cable Management: Integrated cable channels and multiple tie-down points make it easy to route and organize cables for a clean, organized build.
Back-Connect Motherboard Compatible: Ready for rear-connector motherboards like ASUS BTF and MSI Project Zero, enabling a clean, cable-free aesthetic.
Tool-Free Access: Removable top, front, and side panels allow for easy upgrades and cleaning—no tools required.

Two computer cases, one white and one black, are displayed side by side on a gradient blue and purple background. Both cases have transparent panels showcasing internal components.

Sized Down. Powered Up.

The H3 Flow delivers high-performance airflow in a space-efficient micro-ATX footprint. With fine mesh panels, a ventilated PSU shroud, and support for large components, it keeps powerful parts cool without taking over your desk.

White computer case with labeled internal dimensions: 389 mm (15.31 in) wide, 225 mm (8.86 in) deep, and 400 mm (15.75 in) tall. Mini-ITX and micro-ATX motherboard sizes are shown in purple inside the case.

Space-Saving Design

The micro-ATX form factor fits into smaller spaces, maximizing desk space without compromising on performance.

A computer case with arrows showing airflow: cool air enters from the front and bottom, and warm air exits through the top and rear. A magnified section highlights the mesh front panel.

Optimized Airflow

Ultra-fine mesh on the front, top, and sides enhances cooling while filtering dust. The ventilated PSU shroud optimizes intake from bottom-mounted fans.

Close-up of a white computer case interior with a blue banner stating Up to 377 mm. At the bottom right, a label reads 50 Series Ready in green and black. Temperature display shows 32°C.

Full-Size GPU Support

Max length of 377 mm (no front fans), 352 mm (with fans), 317 mm (with fans & radiator).

7-Fan Capacity

Supports up to 140 mm fans (two front, two top) and 120 mm fans (two bottom, one rear).

A white PC case interior with labels showing radiator support: up to 120 mm on the left, up to 240 mm at the top, and up to 280 mm on the right side of the case.

Radiator Ready

Supports a 280 mm front radiator and a 240 mm top radiator for versatile cooling setups.

Back-Connect Ready

Compatible with ASUS BTF and MSI Project Zero motherboards for a clean, cable-free build.

A black PC case with its side, front, and top panels removed, showcasing the interior frame, cooling fan, and ventilation areas. The panels are displayed slightly apart from the main chassis.

Tool-Free Access

Easily remove panels for building, upgrading, or cleaning.

A white, empty NZXT computer case with cutouts for components, cable management holes, and mounting brackets visible inside. The interior is clean, minimal, and ready for PC assembly.

Easy Cable Management

Integrated cable channels and tie-down points make routing clean and simple.

Tech Specs

Dimensions

Height (with feet)

400 mm (15.75 in)

Width

225 mm (8.86 in)

Depth

389 mm (15.31 in)

Volume

35.0 L

Weight

4.8 kg (10.58 lb)

General

Enclosure Type

Micro-ATX Case

Motherboard Compatibility

Micro-ATX, Mini-ITX

Supports Rear-Connecting Motherboards (BTF, Project Zero)

Yes (Micro-ATX)

Materials

SGCC steel, clear tempered glass (white), tinted tempered glass (black)

Clearance

CPU Cooler Height

170 mm

GPU Length

Up to 377 mm (without front fans) Up to 352 mm (with front fans) Up to 317 mm (with front radiator and fans)

PSU Length

Up to 185 mm

Cable Routing Space

Up to 31.5 mm

Front Radiator + Fan Thickness

Up to 63 mm

Top Radiator + Fan Thickness

Up to 70 mm

Front I/O Ports

USB 3.2 Type-A

USB 3.2 Gen2x2 Type-C

Expansion Slots

Standard

Vertical

Drive Bays

2.5"

1+2

3.5"

Fan Support

Front

2 x 120 mm / 2 x 140 mm

Top

2 x 120 mm / 2 x 140 mm

Bottom

2 x 120 mm

Rear

1 x 120 mm (1 x F120Q (CV) included)

Radiator Support

Front

Up to 280 mm

Top

Up to 240 mm

Fan Specs

Model

F120Q (CV)

Speed

1,350 ± 150 RPM

Airflow

60.2 CFM

Static Pressure

1.05 mmH2O

Noise

24.1 dBA

Fan Connector

3-pin

Warranty

2 years

Product Info

Model Number

CC-H31FW-01 CC-H31FB-01 CC-H31FW-02 CC-H31FB-02

UPC

810074848039 810074848046 810074843508 810074843515

EAN

5056547207971 5056547207988 5056547203393 5056547203409

Frequently Asked Questions

Can I vertically mount my GPU?

The H3 Flow only has 4 PCIe slot brackets, so vertical GPU mounting is not supported.

Are they compatible with Micro-ATX back-connect motherboards?

Yes, the H3 Flow works with back-connect boards from major brands like MSI and ASUS. Just note that some thicker cables may require tighter bends—using flexible cables and taking your time with cable management can help.

Are there any removable dust filters?

Only the top of the case features a removable mesh panel for easy cleaning. Instead of traditional dust filters, the case utilizes perforated panels that provide excellent airflow while helping keep dust out — reducing the need for extra filters.

What is the difference between the H3 Flow and the H5 Flow?

The H3 Flow is a smaller version of the H5 Flow, designed for micro-ATX motherboards with added support for back-connect motherboards. Here’s a look at their dimensions side-by-side:

H3 Flow: 400 mm x 225 mm x 389 mm | 4.8 kg
H5 Flow: 465 mm x 225 mm x 430 mm | 7.28 kg

What should I know before installing an SSD in this case?

There’s an SSD mounting point on the back of the motherboard tray. If you’re planning to use it, it’s best to install the SSD before mounting your motherboard. That way, you’ll have easier access and smoother cable management.

H3 Flow

H3 Flow

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