The base for a glass candle holder?
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(your answer makes the most sense…) 
Abstract crab. 
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(snorted)
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Looks like it might leak a bit 
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Ooh - taking your shiny new 6" vivosun down to a 4" 
- presumably with some sort of cover in its future!
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Oh nice practical cut!
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And now I’m thinking “I wish I would’ve thought of that”.
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For the inlet side.
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Was gonna say a base for one of these… But guess it’s to air out one of them instead 
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FWIW, I’ll share it once I’ve installed everything and am happy with the fit. I’ll say it’s strong enough - I am able to lift the whole fan (~7lbs) by just gripping the vanes you see at the “top” of the 2nd pic.
Trying to find my box of heavy duty latex gloves to make the initial cover.
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I was seeing a crab too.
Cooooooooooool!
You’re on a roll!
Nice work. However, HD does sell 6" louver vents. I have one. Yours looks stronger.
One of the louvers on mine lost the tab on one side and fell off.
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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!
