Hi philipma1957,
How far should the tunnel be? can i make a shorter tunnel say 1ft x 2ft? or the length helps in the sound proofing?
at least 4 feet long to muffle sound.
it can be 1 foot by 1 foot by 4 feet
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those ducts on eBay are really bad as they restrict air flow.
but you can try them and see for your self
I'm about to get the Avalon. Does these avalon fit with fan duct cooling shroud shown in the link below?
https://www.amazon.com/Antminer-120mm-Duct-Cooling-Shroud/dp/B01M0N30QC (
https://www.amazon.com/Antminer-120mm-Duct-Cooling-Shroud/dp/B01M0N30QC)