Or you may have a distance issue.
Dryer vent hose in attic.
The high humid air doesn t vent out of the house before it condensates in the duct and then runs back into the house causing damage.
Most dryer ducts are round and 4 inches in diameter.
Dryer vent pipes properly called vent ducts come in a variety of materials.
Use a section of vent pipe to mark a circle where the opening will be from inside of your home.
You may have a bad boot around the roof vent that is leaking into the attic.
Vent the dryer with 4 in.
No you shouldn t use a towel or other absorbing material.
After locating the shortest route for the ductwork determine the location of the dryer vent exit.
Seal the ceiling penetration so that the duct can expand in length as it heats up during use a standard roof boot such as you d use to flash a vent pipe would work.
Metal duct going vertically from the dryer through the second floor ceiling.
The photo below shows an accumulation of dryer lint in an attic after years of the vent terminating in it.
Sometimes such as in town homes or condos it s not possible to vent a dryer through a wall outside.
In these cases it may be necessary to vent your dryer through the attic.
Venting a dryer into an enclosed space is never a good idea.
Insulating the duct may also help.
The international residential code allows you to run a dryer vent through the attic but you can t terminate it there.
If venting outside isn t an option you can vent the dryer out of the attic through the roof using a special roof vent to keep rain out.
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A dryer vent should be vented outside.
When installing a dryer vent for laundry centers in basement locations keep in mind that the vent hood on the exterior of your home must be at least 12 inches from the ground.
Some are flexible and others are rigid.
Not all dryers will allow for this so be sure to check the owners manual to ensure it can be vented in this manner.
Because all types are sold for use with dryers you would naturally assume that all are suitable for this application.
This code requirement is usually referred to when a homeowner wants to install air conditioning ducts from the house hvac system to the garage but also applies for dryer ducts.
When venting dryers for long distances use rigid metal pipe with as few elbows as possible.