re: Dryer Vent to the Attic

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The 35 feet is a general rule of thumb. Check your dryer manual or google your model to see what it recommends.

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Code says 35 feet minus the 90 elbows as mentioned BUT code also allows for the dryer manufacturer information as an exception. Almost all dryers today will easily exceed the 35 feet. Additionally you can buy elbows that have a large radius that don’t count against the length. Another option is to add an in line filter. You can put this in the wall above the dryer to catch what your dryer misses and you clean it every couple loads.

OP, ideally the dryer vents right out of an exterior wall but sometimes it’s unavoidable and I wouldn’t sweat it if I were you. My dryer is less than a year old and it vents directly out of my house. I have no evidence of lint anywhere beyond the lint filter in my dryer because the new dryers do a good job of catching the lint.