jim wrote:

As someone else said this is bad and probaly the dumbest Idea ive
heard yet run the vent up higher on the wall but thats not the best,
move the machine as that is the best how cold is your world and think
of ice as you run the machine thru a metal pipe . As a certified
whatever you don,t stop this Alisa then stay away from my machine also
here Pvc is against code as if a fire starts in it it will spread
Metal is all that is allowed now.

Then your code writers are morons. PVC will neither burn nor support
combustion.

AMENDMENTS TO INTERNATIONAL RESIDENTIAL CODE

B. The International Residential Code adopted by reference in Section101.2,
2000 International Building Code, is hereby amended as follows:
[...]
Section G2437 (Clothes Dryer Exhaust) is amended by adding section
G2437.5.3 to read as follows:

G2437.5.3 Under slab installation. Exhaust ducts for domestic clothes
dryers
shall be permitted to be constructed of schedule 40 PVC pipe provided that
the
installation complies with all of the following:

1. The duct shall be installed under a concrete slab poured on grade.
2. The underfloor trench in which the duct is installed shall be
completely
backfilled with sand or gravel.
3. The PVC duct shall extend not greater than one (1) inch above the
interior
concrete floor surface.
4. The joints of the PVC duct shall be solvent cemented.

http://www.cstx.gov/docs/residential_amendments.pdf