Popular fittings › Square fan adapter
Square fan adapter
A square fan flange with 105 mm bolt spacing (120 mm fans), transitioning to a hose. Free and adjustable.
Open in the designer →
Opens with the sizes below. Change anything, then export 3MF, STL or STEP. Free, no account, runs in your browser.
Starting sizes
| End | Inner size | Connection |
|---|---|---|
| Inlet | 96 × 96 mm | Mounting flange |
| Outlet | 75 mm (2.95 in) | Hose barbs |
Need another size? Every dimension is editable in the designer, in millimetres or inches.
What it is
Bolts to a square computer or cabinet fan and transitions to a hose barb.
How to measure
120 mm fans use 105 mm hole spacing; 140 mm fans use 124.5 mm. Change the bolt spacing and opening in Connections for other fans. A barbed end goes inside the hose: make its outer size match the hose’s inside diameter.
Print tips
- The export already places every component in its recommended print orientation. Keep supports off sleeves, sockets and any sliding or tight-fit surface so they stay smooth; if your slicer asks for supports, paint them only where an outside overhang needs them.
- The “To buy” list shows the purchased hardware it needs.
Frequently asked questions
- What size should I measure?
- 120 mm fans use 105 mm hole spacing; 140 mm fans use 124.5 mm. Change the bolt spacing and opening in Connections for other fans. A barbed end goes inside the hose: make its outer size match the hose’s inside diameter.
- What should I print it in?
- PLA or PETG both work for dust collection at room temperature. Print in PETG or ASA if the air is warm or the part sits in the sun. Use 3–4 perimeters for an airtight wall; infill matters much less than wall count for ducts.
- What hardware do I need to buy?
- At these starting sizes it needs: bolts or screws, washers. The “To buy” list in the designer gives the exact sizes, lengths and quantities for your dimensions.
- Does it need supports?
- The export already places every component in its recommended print orientation. Keep supports off sleeves, sockets and any sliding or tight-fit surface so they stay smooth; if your slicer asks for supports, paint them only where an outside overhang needs them.
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