Couldn't come up with a better headline.

I have installed spiral ducting in a non-active chimney for HRV. I would like to secure the ducts in the flues and wonder what would be most suitable? I will have a cap over the chimney but it's still quite exposed to moisture.
Regular glass wool insulation binds moisture, which I assume is not desirable. I don't want to use foam either.

What do you think?

Galvanized steel ducts installed in an inactive chimney stack, viewed from above, with adjacent roofing materials and greenery in the background.
 
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