NZXT

NZXT H3 Flow

Name: NZXT H3 Flow – Micro-ATX PC Case – Optimized Airflow – Includes 1 x 120mm Rear Fan – Supports Full-Sized GPUs – Fits 280mm Front, 240mm Top Radiator
Brand: NZXT
SKU: B0DQPMJ6MJ

Bottom line: The NZXT H3 Flow: Fits GPUs up to 377mm long with no front fans installed; main trade-off: built for micro-ATX; standard ATX boards are not listed as supported.

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By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-18

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference. About the author →

Pros & Cons

Pros

✓ Fits GPUs up to 377mm long with no front fans installed
✓ Takes a 280mm front radiator plus a 240mm top radiator
✓ Room for up to seven fans for an airflow-focused layout
✓ Fine steel mesh on panels and PSU shroud filters incoming dust
✓ Back-connect motherboard support for a cleaner cable layout

Cons

✗ Built for micro-ATX; standard ATX boards are not listed as supported
✗ Ships with only one rear F120Q fan, so intake fans cost extra
✗ GPU clearance drops to 317mm with a front radiator and fans installed
✗ Radiators cap at 280mm front and 240mm top; no 360mm mount listed

Manufacturer description

The NZXT H3 Flow (CC-H31FB-01) is a micro-ATX PC case for compact builds that still need to fit full-size hardware. Ultra-fine steel mesh covers the panels and the PSU shroud to let air in and keep dust out. An F120Q (CV) 120mm fan comes pre-installed at the rear, so exhaust airflow works out of the box. Cooling support is the main selling point. You can mount up to a 280mm radiator at the front and a 240mm radiator at the top, or run up to seven fans in total. That lets you use an all-in-one liquid cooler or stay with an all-fan layout. Graphics card clearance depends on what you put up…

SpecPicks Verdict

SpecPicks scored NZXT H3 Flow using a rating × review-volume × price-fit model applied to published specs and reviews across the retro cases & modding category. NZXT's retro cases & modding lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for retro cases & modding of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

How long a graphics card fits in the NZXT H3 Flow?

It depends on the front setup. The H3 Flow fits GPUs up to 377mm with no front fans, 352mm with front fans, and 317mm with a front radiator and fans installed.

Can I install a 360mm AIO liquid cooler in the H3 Flow?

A 360mm radiator is not listed. NZXT lists support for up to a 280mm radiator at the front and up to a 240mm radiator at the top, so plan for a 240mm or 280mm AIO. Check NZXT's spec sheet before buying a larger cooler.

How many fans come with the H3 Flow, and how many can it hold?

It ships with one pre-installed F120Q (CV) 120mm fan at the rear for exhaust. The case supports up to seven fans in total, so you add front and top intake or exhaust fans yourself.

Will a full ATX motherboard fit in the NZXT H3 Flow?

The H3 Flow is sold as a micro-ATX case, and the listing does not state standard ATX support. Plan your build around a micro-ATX board. The listing also notes support for back-connect motherboards.

Does the H3 Flow have dust filtering?

Yes. Ultra-fine steel mesh on the panels and the PSU shroud filters dust while letting air through. The mesh still collects dust over time, so clean it periodically to keep airflow up.

Key Features

SPACE-SAVING SIZE — A space-efficient micro-ATX chassis that accommodates high-performance components without compromise.
HIGH-AIRFLOW DESIGN — Ultra-fine steel mesh on the panels and PSU shroud maximizes airflow while effectively filtering dust.
EXTENSIVE COOLING SUPPORT — Supports up to a 280 mm radiator at the front, a 240 mm radiator at the top, and up to seven fans for powerful cooling performance.
FULL-SIZE GRAPHICS CARDS — Fits GPUs up to 377 mm (without front fans), 352 mm (with front fans), and 317 mm (with front radiator and fans installed).
PRE-INSTALLED REAR FAN — Comes equipped with a F120Q (CV) fan at the rear for efficient exhaust airflow right out of the box.

Full Specifications

Brand	NZXT
Color	Black
Material	Alloy Steel
Case Type	Mid Tower
Model Name	NZXT H3
Unit Count	1.0 Count
Model Number	CC-H31FB-01
Compatibility	PC
Built-In Media	NZXT CS CC-H31FB-01 H3 FLOW Mid Tower Tinted TG Black Retail
Cooling Method	Air
Mfr Part Number	CC-H31FB-01
Antenna Location	Gaming
Compatible Devices	Micro-ATX motherboards, full-sized graphics cards, various cooling systems (radiators and fans), standard power supply units, storage drives, and expansion cards
Enclosure Material	Alloy Steel
Total USB 3.0 Ports	2
Warranty Description	2 Year Manufacturer
Supported Motherboard	Micro ATX
Internal Bays Quantity	7
Motherboard Compatability	Micro ATX
Power Supply Mounting Type	Bottom Mount
Full listing title	NZXT H3 Flow – Micro-ATX PC Case – Optimized Airflow – Includes 1 x 120mm Rear Fan – Supports Full-Sized GPUs – Fits 280mm Front, 240mm Top Radiator – Back-Connect Motherboard – Black

Ready to buy?

NZXT H3 Flow – Micro-ATX PC Case – Optimized Airflow – Includes 1 x 120mm Rear Fan – Supports Full-Sized GPUs – Fits 280mm Front, 240mm Top Radiator – Back-Connect Motherboard – Black is vintage hardware; the used and vintage market on eBay carries most of the live inventory. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. It also has an Amazon listing — check it for current price and availability. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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