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H3 Flow
Micro-ATX Airflow Case
Key Specs
Dimensions (H x W x D): 400 x 225 x 389 mm (15.7 x 8.9 x 15.3 in)
Volume: 35.0 L
Motherboard Support: Micro-ATX, Mini-ITX
GPU Clearance: Up to 377 mm (352 mm with front fans, 317 mm with front radiator and fans)
CPU Cooler Clearance: Up to 170 mm (6.7 in)
Front I/O: 1x USB 3.2 Type-A, 1x USB 3.2 Gen 2x2 Type-C
Inside the Box
H3 Flow
F120Q (Case Version) x1
Installation Accessories
User Guide
Warranty & Return Policy
Warranty coverage — See NZXT warranty terms by product
Returns & exchanges — NZXT components and accessories are sold through authorized retailers. Start a return or exchange with the retailer you purchased from.
Warranty service — Submit a request to NZXT Support. Proof of purchase from an authorized NZXT retailer is required.
Resources
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.
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.
Space-Saving Design
The micro-ATX form factor fits into smaller spaces, maximizing desk space without compromising on performance.
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.
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).
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.
Tool-Free Access
Easily remove panels for building, upgrading, or cleaning.
Easy Cable Management
Integrated cable channels and tie-down points make routing clean and simple.
Tech Specs
General
- Enclosure Type
- Micro-ATX case
- Motherboard Support
- Micro-ATX, Mini-ITX
- Back-Connect Motherboard Support
- Yes (Micro-ATX)
- Power Supply Type
- ATX
- Materials
- SGCC steel, clear tempered glass (white), tinted tempered glass (black)
Dimensions
- Dimensions (H x W x D)
- 400 x 225 x 389 mm (15.7 x 8.9 x 15.3 in)
- Volume
- 35.0 L
- Weight
- 5.017 kg (11.1 lb)
Clearance
- CPU Cooler Height
- 170 mm (6.7 in)
- 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 (7.3 in)
- Cable Routing Space
- Up to 31.5 mm (1.2 in)
- Front Radiator + Fan Thickness
- Up to 63 mm (2.5 in)
- Top Radiator + Fan Thickness
- Up to 70 mm (2.8 in)
Front I/O
- USB 3.2 Type-A
- 1
- USB 3.2 Gen 2x2 Type-C
- 1
Expansion & Drives
- Expansion Slots
- 4
- 2.5" Drive Bays
- 1+2
- 3.5" Drive Bays
- 1
Cooling Support
- Front Fans
- 2 x 120 mm / 2 x 140 mm
- Top Fans
- 2 x 120 mm / 2 x 140 mm
- Bottom Fans
- 2 x 120 mm
- Rear Fan
- 1 x 120 mm (1 included)
- Front Radiator
- Up to 280 mm
- Top Radiator
- Up to 240 mm
Included Fan Specs
- Model
- F120Q (Case Version)
- Quantity
- 1
- Speed
- 1,350 ± 150 RPM
- Airflow
- 60.2 CFM
- Static Pressure
- 1.05 mmH₂O
- Noise Level
- 24.1 dBA
- Fan Connector
- 3-pin
Product Info
- Warranty
- 2 years
- Model Number
- CC-H31FW-01 (White) / CC-H31FB-01 (Black) / CC-H31FW-02 (White AU) / CC-H31FB-02 (Black AU)
- UPC
- 810074848039 (White) / 810074848046 (Black) / 810074843508 (White AU) / 810074843515 (Black AU)
- EAN
- 5056547207971 (White) / 5056547207988 (Black) / 5056547203393 (White AU) / 5056547203409 (Black AU)
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.