forced air heat through collapsing concrete floor please help me!

[SALMON KILLER]

My house is on a cocrete slab and the forced air heater ducts are like some old sauna tubes that are collapsing, along with the concrete. I am having to kill mice in them, this is not a good thing. I need to fix this problem. Can i run my heater ducting through the attic, remember i live in Alaska?

[HayZee518]

if you have the room use flexi duct. this is a flexible fiberglass with aluminized product. as far as fixing the floor, what causing it to collapse?

[SALMON KILLER]

I Think It Is Just Old, Over 50yrs. Can I Run That Ducting Through My Attic?

[HayZee518]

I don't see why not!