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re: Dryer Vent to the Attic
Posted on 12/4/19 at 10:51 pm to mdomingue
Posted on 12/4/19 at 10:51 pm to mdomingue
quote:
The 35 feet is a general rule of thumb. Check your dryer manual or google your model to see what it recommends.
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.
1
Posted on 12/5/19 at 7:11 am to ashy larry
quote:
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.
All dryers will work No matter the length, it’s just the time it will take. The efficiency of the dryer is considerably reduced after 30 ft of length with a standard blower. I highly recommend those stronger blower dryers that are designed for longer vent lengths. They are just a standard dryer with a stronger blower to give you more push. Even if it’s a questionable distance, more airflow is better.
Posted on 12/5/19 at 8:09 am to Polar Pop
quote:
ETA: I just saw this is out of a gable so disregard, but Ill leave this up in case it helps someone else.
Initially though the same thing then reread before I posted.
Posted on 12/5/19 at 8:11 am to Polar Pop
Hey, thanks. 
I think I will install one of those.
I think I will install one of those. 
Posted on 12/5/19 at 1:31 pm to Vacherie
the Gable is Hardy Plank? or the siding is hardy?
Posted on 12/5/19 at 10:51 pm to baldona
That time is part of the problem. No residential dryer has the CFM to effectively vent through long runs, especially after the air crashes into the 90 degree ductwork in the wall leading to the attic. Also, in the winter that duct work rapidy condenses the moisture out of the dryer air, I've seen old ducts with holes rusted into them and that moisture effectively traps and glues whatever lint it catches to the inside of the duct. Even a 200 CFM dryer will have that cut down to nearly half by the time it reaches the attic. The extra 170 - 200+ CFM of a duct booster makes a big difference in keeping fine lint moving and getting clothes dried faster.
Posted on 12/9/19 at 5:52 am to Vacherie
I don't know why they do that now. It is horrible. Usually the lint makes its way into the attic and builds up. You will need to check the end of the pipe on the roof every few months and clean the lint screen.
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