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80 mm To 60 mm Fan Adapter
A 28 mm tall tapered duct that lets a 60 mm fan feed an 80 mm fan opening (or vice versa): 80 x 80 mm flange with M4 clearance holes on the 71.5 mm pattern at the bottom, 60 x 60 mm face with four 3.4 mm self-tapping M4 bosses on the 50 mm pattern on top. The airway necks smoothly from 73 mm to 55 mm with a 2 mm wall, so it replaces a grinder/zip-tie bodge on amp racks, 3D-printer electronics bays and PC cases.
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