Mice are getting in my house in a area of my home where I have ducts coming from the crawlspace through the floor up to our second floor and I would like to find a solution what can I use to seal off this entry point since ducts are flexible I can't think of anything that will bond subflooring to ducts
Sealing off duct work
hvacsealing
Related Solutions
It's a butterfly style diffuser damper. Home depot sells them, but I don't see one that has the long collar that you would want to attaching to the flex tube.
Your best bet is finding an online retailer that supplies parts for the flex duct systems. I see this one from a google search that includes the grille and damper box:
Drywall is the enemy.
That dryer vent is disconcerting; lets find out what other shenanigans are going on here. You may not have ever done ductwork but at least you seem to know a proper installation will require opening the walls to install rigid (use flexible only if you must).
Can you run it in the attic, sure: at a loss of efficiency; longer run, more leaks\back-pressure. Also, efficiency will drop like a rock if you run any ducts through unconditioned space. Ideally everything is within the building envelope.
Running ducts isn't that hard; fixing what you had to destroy to get them in, is.
You will cut yourself while working with sheet metal. Proceed slowly and methodically; everything is sharp...
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Best Answer
The best money spent would be finding where the critters are entering the home or crawl space and sealing that access point. Changing or modifying the duct work will be a costly procedure, and the critters may still get into your living space through some other means. If you still want to seal off the flex ducts, call a local HVAC company and ask for a price to replace with metal ducting.