From the Loftsmith community

Round backdraft damper (4" + 2")

Stops cold air and drafts from creeping back down a vent or exhaust duct. Each round housing holds a two-part flap on a hinge that swings open with the airflow and drops shut when it stops. Change the duct diameter and the fit clearance to match your own pipe.

6 parts · 64 g · 192 × 111 × 36 mm

Two round ducts, one large and one small, each with a hinged two-part flap inside and a flat rim
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No adjustable sizes

Ask for the sizes you want to tweak, e.g. “make the width adjustable”.

Change it in the Studio
I printed this Remix

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