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Yuck. I'd find and fix where the mice entered the structure, then I'd replace the flex duct. The inner sleeve of flex duct won't take much abuse.
Just as a point of reference, in 2006 a 10" (that's inner diameter) by 25' long length at Home Depot was $35.98. They also have any take-off fittings, etc. that are used with it. Also gray (not white) giant plastic zip-ties like camloki talked about. For tape, I use the Nashua 324A foil tape. It sticks better than any tape I've used. Has release paper on the back of it. Position carefully, because when it touches, it's on!
If you go sheet metal duct instead, you will have to buy a lot of fittings, do a lot of cutting, sheet-metal screwing, taping, etc. Then, you will have to insulate the outside of the metal duct, with care to make the outer vapor barrier continuous.
I've done a lot of both over the years.
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-- Telly, the D-I-Y guy --
Two fools dancing on the hands of time
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