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120 mm Ventilation 3D Models: Grills, Ducts, Filters

This collection gathers STL files for 120 mm ventilation: fan grills and covers, dust filters, duct adapters and pipe vents. It is useful when you are building an enclosure, a PC case or a grow setup and need a part that matches a standard fan frame. Most items are small enough to print on a common 3D printer in one piece. Polyzon does not confirm whether models are free, their price, license, official status, affiliation, safety or fitness. Check the current terms at the source.

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選定基準：Polyzon編集部 · 本文の更新日：2026年10月14日

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«120 mm Ventilation 3D Models: Grills, Ducts, Filters»

The models fall into a few groups. Grills and covers sit on the outside of a fan and are mostly about appearance and finger protection, while filter holders add a mesh layer that has to be removable for cleaning. Ducts and adapters change the shape or the diameter of the airflow path, often stepping between a square fan frame and a round pipe. Pipe vents, louvres and backdraft flaps belong to the wall or duct side of the system and usually have a larger flat face for mounting.

When choosing a file, open the author's page and read the listed dimensions first: nominal fan size, hole spacing, opening diameter and wall thickness. Check how many parts the model has and whether they are joined with screws, clips or glue, and look at the notes on supports, orientation and material. Photos of real prints show how the surfaces and thin ribs come out, which matters for grills with narrow slots.

To widen the search, try other words for the same object: fan cover, louvre, air vent, duct adapter, damper, fume extraction. Combine a size with a purpose, for example a fan size with a pipe diameter, or a fan size with a case, tent or enclosure. Related sizes such as 100 mm, 140 mm or 92 mm often appear in the same family of files, and a parametric version may let you adjust the fit yourself.

FAQ

よくある質問

What does the 120 in these models refer to?
It is usually the nominal size of the fan frame or the pipe diameter in millimetres. The actual opening, hole spacing and outer dimensions can differ between files, so compare them with your part before printing.
Do these ventilation parts need supports?
Flat grills and covers often print without them, while ducts with round or angled cross-sections may need supports on overhangs. The author's page usually states the orientation and whether supports are required.
Which material should I use for a fan duct or vent?
PLA works for cool indoor air paths, while PETG or ABS is often chosen where warmth or moisture is present. Check the material and settings listed by the author, since thin ribs behave differently across filaments.
How do I find an adapter between two different sizes?
Search with both dimensions together, such as a fan size and a pipe size, and read the description for the transition direction. Confirm the pipe outer diameter and wall thickness, because pipe standards vary by region.
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