Fractal Design FD-CA-DEF-R6C-BK-TGL

Fractal Design Define R6 ATX Mid Tower Computer Case User Manual

Model: FD-CA-DEF-R6C-BK-TGL

Brand: Fractal Design

1. Introduction and Overview

The Fractal Design Define R6 is an ATX mid-tower computer case engineered for optimal airflow and silent computing. It features ModuVent technology, a PSU shroud, a modular interior, and extensive water-cooling support. This manual provides detailed instructions for setting up, operating, and maintaining your Define R6 case.

Fractal Design Define R6 computer case with USB-C port

Figure 1.1: Overview of the Fractal Design Define R6 case, highlighting its sleek design and front panel connectivity.

Key Features:

  • Timeless Scandinavian Design: Features a full-size, scratch-resistant tempered glass side panel with a push-to-lock latching mechanism.
  • Optimized for Silence: High-density industrial dampening on side, top, and front panels.
  • ModuVent Technology: Offers a choice between a soundproof steel cover or filtered multi-fan ventilation in the top panel.
  • Excellent Cooling Support: Includes three Fractal Design Dynamic X2 GP-14 140 mm fans. Nine fan positions with clear airflow paths.
  • Water-Cooling Ready: Supports up to a 420 mm radiator in the top, 360 mm in the front, and 280 mm in the base.
  • PSU Shroud: Conceals HDD trays and excess cabling for a clean interior.
  • Modular Interior: Innovative storage plate allows conversion between standard layout (maximum storage) and open layout (superior water cooling and airflow).

Video 1.1: Official product video showcasing the features and modularity of the Fractal Design Define R6 computer case.

2. Setup and Installation

2.1 Unpacking and Initial Access

Carefully remove the case from its packaging. The Define R6 features tool-less side panel removal for easy access to the interior. The tempered glass side panel is secured with a push-to-lock latching mechanism.

Fractal Design Define R6 with tempered glass side panel

Figure 2.1: Left side view of the Define R6, showing the tempered glass panel.

2.2 Motherboard Installation

The Define R6 supports ATX, Micro ATX, and Mini ITX motherboards. Install standoffs as required for your motherboard form factor. Secure the motherboard using the provided screws.

Internal view of Fractal Design Define R6 showing motherboard tray

Figure 2.2: Internal layout of the Define R6, illustrating the motherboard mounting area and cable routing options.

2.3 Storage Drive Installation

The case includes six universal 2.5"/3.5" SSD/HDD trays that can be repositioned. Additionally, two dedicated 2.5" SSD trays are located behind the motherboard tray or on top of the PSU shroud.

  • 3.5"/2.5" Drive Trays: These trays can be installed in various positions within the main compartment or behind the modular storage plate.
  • 2.5" SSD Trays: Mount these drives on the PSU shroud or behind the motherboard tray for a clean look.
Fractal Design Define R6 HDD and SSD mounting options

Figure 2.3: Illustration of the versatile HDD and SSD mounting locations within the Define R6.

2.4 Power Supply Unit (PSU) Installation

Install your ATX power supply into the dedicated compartment at the bottom of the case. The integrated PSU shroud helps conceal the power supply and its cables, contributing to a tidy build.

Fractal Design Define R6 PSU shroud

Figure 2.4: View of the PSU shroud, designed to hide the power supply and cables for a clean aesthetic.

2.5 Cooling System Installation (Fans & Radiators)

The Define R6 offers extensive cooling options. It comes with three 140mm fans pre-installed (two intake, one exhaust). Additional fan positions are available on the front, top, and bottom. For water cooling, the case supports large radiators:

  • Top: Up to 420 mm radiator
  • Front: Up to 360 mm radiator
  • Base: Up to 280 mm radiator

The Nexus+ Smart Hub provides control for up to six case fans and three PWM devices via your motherboard.

2.6 Vertical GPU Mounting (Optional)

The Define R6 supports vertical GPU mounting for enhanced aesthetics. This requires a Flex VRC-25 Riser Kit, which is sold separately.

Fractal Design Define R6 with vertical GPU mount

Figure 2.5: Example of a vertically mounted GPU within the Define R6 (riser kit sold separately).

2.7 Front I/O Connections

The front panel features:

  • 2 x USB 2.0 ports
  • 2 x USB 3.0 ports
  • Audio in/out
  • Power button with LED indicator
  • Reset button

An optional USB 3.1 Gen 2 Type-C port is available via a Connect D1 upgrade kit (sold separately), offering up to 10Gbps transfer speeds.

Fractal Design Define R6 front I/O panel with USB-C

Figure 2.6: Close-up of the front I/O panel, showing USB ports and audio jacks.

3. Operating Instructions

3.1 Powering On/Off

Press the power button located on the top front panel to turn on your system. To power off, either shut down via your operating system or press and hold the power button for several seconds.

3.2 ModuVent Technology

The ModuVent system allows you to choose between silent operation and enhanced airflow. The top panel features a removable sound-dampening steel cover. Removing this cover reveals a filtered multi-fan ventilation setup, allowing for additional cooling or radiator installation.

Fractal Design Define R6 top panel with ModuVent cover

Figure 3.1: Top view of the Define R6, showing the ModuVent cover in place.

3.3 Nexus+ Smart Hub Fan Control

The integrated Nexus+ Smart Hub allows for centralized control of your case fans. Connect your fans to the hub and connect the hub to a PWM header on your motherboard. Fan speeds can then be managed through your motherboard's BIOS or dedicated software.

4. Maintenance

4.1 Cleaning Dust Filters

The Define R6 is equipped with easy-to-clean dust filters on the front, top (under ModuVent), and base. Regularly remove and clean these filters to maintain optimal airflow and prevent dust buildup inside the case.

  • Front Filter: Accessible by opening the front panel door.
  • Top Filter: Accessible by removing the ModuVent cover.
  • Bottom Filter: Slides out from the front of the case.

4.2 Exterior Cleaning

Wipe exterior surfaces with a soft, damp cloth. For the tempered glass panel, use a glass cleaner and a microfiber cloth to avoid streaks and scratches. Avoid abrasive cleaners.

4.3 Internal Dust Removal

Periodically use compressed air to remove dust from internal components, such as fans, heatsinks, and circuit boards, ensuring the system remains cool and performs efficiently.

5. Troubleshooting

5.1 System Not Powering On

  • Ensure the power supply is switched on and properly connected to the wall outlet.
  • Verify all power cables (24-pin ATX, 8-pin CPU, PCIe) are securely connected to the motherboard and components.
  • Check that the front panel power switch cable is correctly connected to the motherboard's front panel header.

5.2 Fans Not Spinning or Excessive Noise

  • Confirm fan cables are properly connected to the Nexus+ Smart Hub or motherboard headers.
  • If using the Nexus+ Smart Hub, ensure it is connected to a motherboard PWM header and configured correctly in BIOS/software.
  • Clean dust from fan blades and filters (refer to Section 4.1).
  • Check for any cables obstructing fan rotation.

5.3 USB Ports Not Functioning

  • Verify that the front panel USB cables are correctly connected to the corresponding headers on your motherboard.
  • Ensure motherboard USB drivers are installed and up to date.

For further troubleshooting, consult your motherboard manual or the Fractal Design support website.

6. Specifications

FeatureSpecification
BrandFractal Design
Model NameFD-CA-DEF-R6C-BK-TGL
Case TypeMid Tower
Motherboard CompatibilityATX, Micro ATX, Mini ITX
MaterialAlloy Steel, Tempered Glass
Cooling MethodAir
Fan Size140 Millimeters (pre-installed)
Total USB 2.0 Ports2
Total USB 3.0 Ports2
Total Expansion Slots7
Internal Bays Quantity6 (3.5"/2.5" universal) + 2 (2.5" dedicated)
Item Weight27.34 Pounds (approx. 12.4 kg)
Special FeaturesHigh-Density Industrial Dampening, ModuVent Technology, PSU Shroud, Modular Interior
Fractal Design Define R6 dimensions

Figure 6.1: Dimensional drawing of the Fractal Design Define R6 case.

7. Warranty Information

The Fractal Design Define R6 computer case comes with a 2-year warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. For full warranty terms and conditions, please refer to the official Fractal Design website or contact customer support.

8. Support

For technical assistance, product registration, or to download the latest drivers and manuals, please visit the official Fractal Design support page:

Fractal Design Support

You can also find additional resources and community forums on their website.

© 2026 Fractal Design. All rights reserved.

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