Product review (4 stars): Dundas heat diverter WORKS beautifully
I find that the Dundas heat diverter works as designed. Yes, it is lightweight and can come apart but with a little tweaking it is well worth the cheap cost. Installation? I just screwed it to the wall.

The biggest complaint that people have is about the screen allowing lint to go through.  SOLUTION Pull off the screen cap, place a used dryer sheet over the opening, put the cap back on.  Now you've got a second, finer screen which, after two uses (dryer sheet length is twice the diameter) you dispose of it.

Moisture accumulation in the laundry room is no problem in that it is a well heated and ventilated area. The moist hot air has plenty of opportunity to disperse and contribute to our comfort. With my gas heat going we have plenty of good use for the moisture.  Win Win. When summer comes I will probably bypass the whole thing connecting the flex tubes to each other making sure all heat goes outside. Yes, it has a flap but it's only about 95% coverage.

I would use metal screw hose clamps on the tubing for maximum fit. That also helps pull the plastic housing together.