I am replacing a deck with a poured concrete patio.

The problem is that my dryer vents under the deck.

Does any see a problem using standard rigid aluminum ducts to extend
from my house out to the edge of the patio? I will be pouring concrete
on top of the 4" rigid vent.

I have thought of using PVC instead, but I would expect that would be
a hazard were the dust in the vent to ignite.

Missing the patio is not an option, since I would have to route the
vent through several floor joists.

Any better ideas?

Thanks.

Rick