92mm fan to 4" inch hose ducting adapter
thingiverse
Custom Fan Adapter: Attach 4" Hose or Ducting to 92mm Fan in Record Time! Print time was a swift 2 hours, making it easy to get the job done quickly. I'm happy to create one for you too - and as an added bonus, shipping is usually done on the same day. Check out this listing if you're interested: https://www.etsy.com/listing/675861507/92mm-fan-to-4-inch-hose-ducting-adapter
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