Product review (4 stars): Solved my venting problem, working well, and the price was right.
The fan works great and has solved the venting problem completely. I have yet to mount the current sensor, not that it's hard to figure out how to wire it, but it is a real pain to mount because it does not fit standard U.S. boxes. I am going to have to cobble together a two gang box with a depth extender. Someone suggested mounting it on the back of the dryer and I will say, I have not yet ruled that out because I would rather not disrupt the steel conduit housing the 220 line (again, simply because it is a lot of extra work). I will advise readers that the fan is mounted below a floor joist using the included base and some lag screws, and it's loud in the room above. No one seems to offer a hanging motor vibration mount so I will need to make it myself. This is also doable but very annoying.

UPDATE 20 January 2016: The fan is still working well. My final solution to mount the current switch was a double-gang metal "deep" box with an extension cover on top. This gave me enough room to push the detector inside and to wire an outlet on the cover. I bought a 6 ft dryer cable, split the wires and threaded right through the box. The box is mounted on the wall behind the dryer and gets fan power by a line cord that plugs into the same outlet as the washer. Works perfectly. Note, the hose clamps I put on the fan worked unscrewed under thermal stress. I will need to check them every few months.  To reduce vibration, I bought some rubber vibration absorbing bushings and put them on the lag screws that hold the bracket to the ceiling joist. Not a great solution, but it reduced the noise and didn't require much effort.