We've added a den to the back of our house (where the dryer vent was vented)
The wall where the dryer vented will now house a new fireplace. We have two
options. Going up thru the attic (vented outside) or an elbow turn to the
left and down the wall about 20 ft. Is an inch slope enough of a slope?
This is metal duct work and will be housed in a wooden box as there will be
brick and stone (for the fireplace and hearth) surrounding it. I just
can't see going UP thru the attic with moisture laden air. Seems like it
would be too "heavy" and the clothes would take forever to dry. All
precautions have been considered if we vented down the side of the wall.
Lumber is treated, there is ample space between the firebox and ductwork.
Where the duct elbows out of the wall, there will be cabinets so access to
the elbow is possible from either side of the wall (den side or laundry room
side). Here is a link to a picture that might be useful in visualizing what
I'm trying to explain. This has been a temporary setup. The new duct, as I
said earlier will be metal and encased in a wood box. This temporary setup
is sloped more than we would be able to do permanently. At this current
height the hearth and firebox would have to be too tall.
There ought to be a law against venting dryers anywhere except through an
outside wall according to an acquaintance, a professional architect. A further
comment, "This is what happens when you just pick up a hammer and start
remodeling". His suggestion, tear out the mistakes, get some professional help
planning, and do it right.
That said, maybe it might be prudent to build a laundry addition following best
practices for appliance requirements. One might also consider moving the
laundry facilities upstairs as has been mentioned in this NG before. HTH.
You do not want a 20 foot long horizontal dryer run--the dryer won't work!
They can't stand that much duct resistance. "up" is actually not a problem,
warm air (even warm moist air) rises, otherwise chimneys would never have
been invented. But if you have to go up 20 feet, say, you are still going
to have a problem unless you use larger ductwork (5 or 6 inch would be ok I
think.) And you ARE going to vent thru the roof or something, aren't you?
Dumping that dryer air in the attic would be a disaster.
The shorter and more direct the run, the better. Elbows count for
several feet of straight duct. Clean out is important maintenance, so
the fewer bends the better. If you do go up, continue the duct
Bobst makes a very good point about professional help. Consultations
without extensive drawings can be real cost savers in the long run.
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