Duct-to-wall Adapter (4-inch)
thingiverse
This is a duct-to-wall adapter designed for use with 4-inch ducts, featuring several strategically placed holes to facilitate secure mounting of the adapter. Dimension: Inner diameter: 100.5 millimeters Outer diameter: 103.5 millimeters Diameter for mount disk: 170.0 millimeters Enjoy!
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