Computer fan blower duct
Description
Designed to fit DN40 pipe **Grill** - use standard of-the-shelf wire grill - for fancy 3D printed grill see: [ Customizable Fan Grill Cover ](https://www.thingiverse.com/thing:2802474) **Fan sizes and screw hole spacing:** |fan size|hole spacing| |---|---| |mm|mm| |80|71.5| |92|82.5| |120|105| Source:[Computer fan](https://en.wikipedia.org/wiki/Computer_fan)
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