NZXT H31FB Black Midi Tower PC Case – Compact Build
NZXT

NZXT H31FB Black Midi Tower PC Case – Compact Build

  • Maximum CPU cooler height170
  • Supported HDD sizes2.5/3.5
  • Maximum graphics card length377
  • Number of power supply units1
  • Width225 mm
  • USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity1
  • Top fans diameters supported120/140

The NZXT H31FB is a compact black midi tower built for builders who want a tight, efficient setup without compromise. This case supports micro ATX and Mini-ITX motherboards, giving you real flexibility in a smaller footprint—ideal if you're working with space constraints but don't want to sacrifice performance potential.

  • Supports both micro ATX and Mini-ITX platforms, so you're not locked into one motherboard size
  • Ships with one pre-installed fan to get you started immediately
  • Clean black finish suits any desk or workspace aesthetic
  • Midi tower proportions balance compact design with practical cable management room

Description

Built for Tight Spaces, Built to Last

Pick this case if you're assembling a smaller gaming rig, a workstation for your desk, or a living-room media PC. It's the sensible choice when space matters but you still want a proper desktop experience.

Specifications

General

BrandNZXT
Form factorMidi Tower
Model nameH3 Flow
Product colourBlack
MaterialMesh/SGCC/Tempered glass
TypePC
Side windowYes
Cable managementYes
Maximum PSU length185
Number of 2.5" bays3
Number of 3.5" bays1
Rear fans installed1x 120 mm
Number of expansion slots4
Warranty24 months
EAN5056547207988

Display

Tempered glass panel(s)Yes

Processor

Maximum CPU cooler height170

Storage

Supported HDD sizes2.5/3.5

Graphics

Maximum graphics card length377

Ports

Combo headphone/mic portYes
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity1
USB 3.2 Gen 2x2 Type-C ports quantity1

Battery & power

Number of power supply units1

Features

Top fans diameters supported120/140
Top radiator sizes supported240
Rear fans diameters supported120
Front fans diameters supported120/140
Front radiator sizes supported280
Bottom fans diameters supported120
Number of top fans supported (max)2
Supported motherboard form factorsmicro ATX/Mini-ITX
Number of rear fans supported (max)1
Number of front fans supported (max)2
Number of bottom fans supported (max)2

Dimensions & weight

Width225 mm
Depth389 mm
Height400 mm
Weight4.8 kg
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