Product review (5 stars): Periscope Vent
We purchased two new front loaders, a washer and dryer.  The dryer, with the aluminum tubing vent, pushed it out so far from the wall that it made it impossible to close the laundry room door.  So as to not crimp the aluminum venting tube, we had to keep the dryer 6 or more inches away from the wall.  I went to H.D, and found that they had a 0"-6" periscope, as well as a 24"-50"(or something like that) periscope, but nothing between the two sizes.  I found the Whirlpool 0"-18" unit on Amazon, which was what I needed.  Once received, the periscope required about 4" of aluminum to be cut off the unit for it to fit.  Once in place, the dryer could then sit just a couple of inches from the wall.  Perfect!  Problem solved.