RickM wrote:
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

I have installed several dryer vents thru concrete with PVC
pipe. Code in this area limits you to 30' total run and no
more than 180 degrees total in elbows. Less is better,
straight is better, larger is better. No less than 4" pipe
and, if needed, put in a clean out.

Many new homes have washer dryer areas in the middle of the
home for convenience and a pvc pipe through the concrete can
provide the shortests, straightest run to vent.

I have never seen this done, nor seen any specs for using
aluminum in this situation, so I would avoid that for several
reasons, including; strength, deterioration in contact with
cement, and difficulty in maintaining proper slope. Make sure
to have at least 3" of concrete above the pipe (vent). This
may require burying it under the concrete rather than running
it through the concrete.

--
Robert Allison
Rimshot, Inc.
Georgetown, TX