Product review (5 stars): Awesome idea that actually works
I don't normally geek out on stuff like this, but I have to say that the MagVent is a brilliant idea that actually works exactly as advertised. I have a tight laundry room and the dryer vent is routed such that I couldn't use a recessed vent box.  This thing is great - plugged right into the vent pipe through a hole in the bottom of the wall and the magnet clamped on perfectly.  Maybe 10 minutes to get it all configured. I was able to push the dryer all the way back to within 2" of the wall easily gaining 4-5" of space.  I could have used this years ago...