Well, the dryer will be sitting in a bathroom which is just about dead
middle in the house (which is appx 60' long and 40' wide). It will
take two 90 degrees to get it pointed to the foundation for exit, not
counting an additional 90 from the dryer to the proposed vent's hole
in the wall. Closest foundation wall would be appx 15' from the
vent's hole in the floor but that's right next to the front porch. Add
another 3' for the duct from the wall hole to the floor, so min run is
just at 19-20 feet.

According to the mfg's ducting chart, the max for 2 90's rigid 4" duct
run is 16'.


HerHusband wrote:
Unless your house is 80'x80' and the dryer sits right in the middle, I'm
guessing you can find a shorter route to an outside wall. I believe the
maximum length is supposed to be under 25 feet, which you have to subtract
5 feet for every 90 degree elbow (just going from memory on this).

I had a similar situation when I built my house. My initial options were 16
feet up to the roof, or about 20' out to a back wall. Once I stopped
overthinking the situation, I ended up with a short 5' duct run to a side
wall. I went down to the crawlspace, under the joists, then out through the
rim joist in the crawlspace. Two 90's, two 45's, and about 4' of actual
duct. I wrapped the whole thing with metal foil tape and insulation. It
flows wonderfully and can be cleaned easily from outside.

Check your options further. You'll probably find another route that is much
shorter...

Anthony