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My venture in that direction was less than successful as building the frame was a lot easier than making a reasonably air tight cover for it,
6" is a lot easier than 10" or 12" to the outside but I would have a wander about a few stores measuring containers. Really terrific would be a 6" plastic jar with a 4" lid opening. I’m thinking perhaps a lifetime supply of giant dill pickles as a side benefit.

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Nice application of the idea. Show the final assembly when you have it!

Here’s the inside mounting flange attached to the 6" duct…

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