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Lilah,
Universal code states a dryer vent has to terminate within
45' with each 90 degree turn equal to 10' of length. Your
configuration is okay in that the dryer vent fan will move the
air and lint to the outside. I would suggest 5' sections of
30 gauge galvanized pipe (4" diameter) until I reached the
interior wall. I would then install 4" PVC (Well Casing grade)
underground and up to a standard vinyl termination cap with flapper.
You might want to check with the local inspection authority on
the PVC section of your project but I think you will be okay.
Ed Tolbert
Hendersonville, NC
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