Define C Tempered Glass

Created for those who demand a flexible platform for a powerful ATX or Micro ATX build that wastes no space, the Define C TG is the perfect solution to accomplish this balance of capacity and efficiency while opening up the side thanks to a full tempered glass side panel

  • Sound dampening with ModuVent™ technology for silent operation
  • Optimized for high airflow and silent computing
  • Tempered glass side panel for a clean looking exterior with full interior visibility


View specifications

Bring your system together in an exquisite way

Smaller than the usual ATX and Micro ATX case, the Define C TG and Define Mini C TG with its optimized interior provides the perfect base for users. Carrying signature Define series traits, the Define C TG Series brings with it that iconic front panel design, dense sound dampening material throughout and ModuVent technology in the top panel.

Optimized for high airflow and silent computing

Extensive cooling support via both air and water are offered to make sure even the most powerful systems can be cooled effectively
  • Define Series sound dampening with ModuVent™ technology for silent operation in a compact full ATX or Micro ATX form factor

  • Side and front panels are lined with industrial-grade sound dampening material

  • Comes with two preinstalled Fractal Design Dynamic X2 GP-12 120 mm fans optimized to deliver maximum airflow while still maintaining a low noise level

  • Open air designed interior creates an unobstructed airflow path from the front intake to the rear exhaust

Full interior visibility

Tempered glass side panel for a clean looking exterior with full interior visibility

Easy-to-clean filters

Easy-to-clean high airflow nylon filters on the front and base with full PSU coverage and front access for convenience

Hide the mess

Power supply shroud conceals drive cage and excess cabling for an even quieter and cleaner looking interior free of airflow obstructions 

Smart layout and functionality

The open air design offers unobstructed airflow across your core components with high performance and silent computing in mind at every step. 
  • Flexible storage options with room for up to five drives

  • Includes optional top filter to prevent dust buildup when ModuVent is removed for additional fan slots


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"The Define C makes it seem strange that there are cases that aren’t designed like it is: everything fits, everything works, it’s quiet, and it’s tiny." Read the full review
"Fractal Design has done a fantastic job designing the Define C, it is by far one of the highest quality cases we have reviewed thus far." Read the full review
"For such a tiny case, too, it sure packs a punch as there are plenty of features to get excited about – Moduvent, extensive dust filtration and the removable PSU shroud cut-out being just three of the excellent inclusions."


  • 3.5" or 2.5" Drive capacity
  • Dedicated 2.5" drive capacity
    3 (Maximum 2.5" drive thickness is 10 mm)
  • Expansion slots
  • Front ports
    2x USB 3.0, Audio in/out, Power button with LED, HDD activity LED, Reset button
  • Total fan mounts
  • Front fan
    3x 120 or 2x 140 (1x Dynamic X2 GP-12 included)
  • Top fan
    2x 120/140
  • Rear fan
    1x 120 (1x Dynamic X2 GP-12 included)
  • Bottom fan
    1x 120
  • Dust filters
    Bottom fan + PSU, Front fans, Top panel (optional)
  • Cable routing grommets
  • Fixed Velcro straps
  • Captive thumbscrews
    Both side panels, SSD brackets
  • Left side panel
    Tempered Glass
  • Right side panel
    Industrial sound-dampened steel


  • Power supply type
  • Motherboard compatibility
    ATX, mATX, ITX
  • Front radiator
    120/240/360 mm or 140/280 mm
  • Top radiator
    120/240 mm (max component height on motherboard 40 mm)
  • Rear radiator
    120 mm (max width 125 mm)
  • PSU max length
    Maximum 175 mm recommended
  • GPU max length
    Max 315 mm with front fan mounted
  • CPU cooler max height
    172 mm
  • Cable routing space
    15-35 mm


  • Case dimensions (LxWxH)
    399 x 212 x 440 mm
  • Case dimensions - with feet/protrusions/screws
    413 x 217 x 453 mm
  • Net weight
    7.2 kg
  • Package dimensions (LxWxH)
    543 x 295 x 484 mm
  • Package weight
    8.7 kg
  • Volume
    36.9 liters


  • Warranty
    2 Years
  • Package contents
    Define C TG computer case; User manual; Accessory box; Optional top filter
  • EAN
  • UPC
  • Product code