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Home Repair - - If it ain't broken, don't fix it. Otherwise look here.
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Posted by SteveC on February 29, 2008, 7:32 am
Putting in a basement appartment. I want to run 4" ducting up inside a 2x4
wall, up past the 8 foot concrete wall and outside between the floor joist.
Can I bend or squat the 4" to fit in the wall? I guess I could cut out some
of the 2" polystyrene insulation 1/2 and inch to fit.
Steve
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Posted by John Grabowski on February 29, 2008, 7:59 am
> Putting in a basement appartment. I want to run 4" ducting up inside a
> 2x4 wall, up past the 8 foot concrete wall and outside between the floor
> joist.
>
> Can I bend or squat the 4" to fit in the wall? I guess I could cut out
> some of the 2" polystyrene insulation 1/2 and inch to fit.
Restricting the duct could affect the dryer's performance. If going up
inside of the wall is your only option, then I suggest using oval duct. It
will have a larger capacity than the 4" round and is made to fit into walls.
You may have to get some transitions from oval to 4" round fabricated to put
on each end. Any sheet metal shop can do this.
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Posted by Speedy Jim on February 29, 2008, 9:16 am
SteveC wrote:
> Putting in a basement appartment. I want to run 4" ducting up inside a 2x4
> wall, up past the 8 foot concrete wall and outside between the floor joist.
>
> Can I bend or squat the 4" to fit in the wall? I guess I could cut out some
> of the 2" polystyrene insulation 1/2 and inch to fit.
>
> Steve
>
>
http://www.deflecto.com/OMS/tier1_template_2_air.aspx?CategoryID=903
may have what you want.
You would not want any combustible insulation
in the space at all and clearance must be
maintained to the studs/walls.
If the basement apt will be requiring a permit,
ask about the venting requirements at the bldg dep't first.
Jim
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Posted by on February 29, 2008, 11:33 am
> Putting in a basement appartment. =A0I want to run 4" ducting up inside a =
2x4
> wall, up past the 8 foot concrete wall and outside between the floor joist=
.
>
> Can I bend or squat the 4" to fit in the wall? =A0I guess I could cut out =
some
> of the 2" polystyrene insulation 1/2 and inch to fit.
>
> Steve
It is better to run the ducting outside the wall. That's the only way
I've ever seen it done and there are several good reasons I can think
of. 1. The insulation of what is presumable an exterior wall will be
compromised far less. 2. It will be easier to access or service ithe
ducting n the future should the need arise. 3. That vent will get
hot and could be a fire hazard if placed inside a wall.
I know it sounds neat to hide the vent inside the wall but I do not
see it as a good idea
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Posted by on March 1, 2008, 11:15 am
> Putting in a basement appartment. I want to run 4" ducting up inside a 2x4
> wall, up past the 8 foot concrete wall and outside between the floor joist.
>
> Can I bend or squat the 4" to fit in the wall? I guess I could cut out some
> of the 2" polystyrene insulation 1/2 and inch to fit.
>
> Steve
Steve:
You must have a duct with the same cross-section area as the 4in duct.
Since a 4in duct has a cross -section of about 13 sqin, you must have
a rectangular duct of at least that cross section.
I have done what you are trying to do; installed a dryer on the second
floor and moved the vent up a wall, into the attic and to the top of
the roof. Total linear footage is about 12 feet, vertically, with only
one bend, the 90 degree between the dryer and the wall. My 4in duct
goes into a rectangular 3inx10in heating duct, and then connects at
the roof with a 4in discharge vent. I thought that I might have a
problem with the velocity of the discharge (since the area in the
rectangular duct is much larger than the area of the 4in duct), and I
have checked periodically to see whether lint accumulated at the
bottom of the rectangular duct, and none is present. That's been seven
years since I moved our laundry room to the second floor. I have had
no problem whatever. FWIW, it's a Maytag Neptune gas dryer.
Yes, I have a pan connected to a drain under the washer. Thanks.
Pierre
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