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Old 01-03-2012, 03:18 PM   #1
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dryer venting


My dryer vents to the exterior under a stairwell. A licensed contractor did that. I now have moisture, mildew, etc. under the stairwell. Can I add another vent hose to the existing one and run it out beyond the stairwell? In short, how long can a vent hose be before it becomes inefficient? thx

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Old 01-03-2012, 03:20 PM   #2
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dryer venting


how long to you want to go ..most dryers have information that covers this...old or newer dryer ..picture would help..

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Old 01-04-2012, 07:36 AM   #3
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dryer venting


I think you're supposed to limit a dryer run to 25ft (without a booster in-line)...subtracting 5 feet for every 90degree turn and 2.5ft for every 45degree bend. I think those number are right but someone can correct me if not. I can get my code site to pull up.
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Old 01-04-2012, 08:14 AM   #4
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dryer venting


Lack of room ventalation is the likly cause for your problum.
Changing out the door to a louved door may be enough to get some air flow.
Adding a return air vent in the room would also aid in removing the moisture.
For now I'd wipe down all the walls with bleach and water to kill the mold and paint it with bathroom paint with a midicide in it.
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Old 01-04-2012, 08:17 AM   #5
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dryer venting


Is it just an exposed hose? Under the stairwell = doesn't receive adequate ventilation via the home's air system . . . usually areas like closests and cabinets remain slightly more damp in humid weather and cooler. . . if you have heat from an exposed and uninsulated dryer line clashing with the coolness of a small space it will create condensation.
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Old 01-04-2012, 08:22 AM   #6
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dryer venting


Sounds to me like the poster is talking about a dryer vent that is exiting OUTSIDE underneath an EXTERIOR set of stairs and the condensation is caused by the hot air hitting cooler air in an EXTERIOR confined space like the backside of a set of stairs.

Yes you can add a few feet to it to get it out from under the stairs, assuming you are not already running 25 feet to reach it.

While it may be important to check local guidelines, there are general guidelines followed by the International Mechanics Code. They state that a straight duct be no longer than 25 feet. In addition, if there is a 45 degree bend, then deduct 2.5 feet from the recommended length, and if there is a 90 degree bend, deduct 5 feet. So, if you have a space that will need two 90 degree bends, then you should have no more than 15’ of dryer duct.

Last edited by oldhouseguy; 01-04-2012 at 08:31 AM.
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Old 01-04-2012, 09:03 AM   #7
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dryer venting


good point - maybe so.

silvertone: please clarify - is this stairwell outside or inside?

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