Product review (5 stars): PERFECT FOR A PORTABLE DRYER!
I have used this a few times with my new 2014 Panda dryer.

I was afraid that my apartment would become uncomfortably humid during use; not so!  Of course, I stayed out of the room where the dryer was being used.  However, the heat did not transfer from one room to another (and I live in a railroad apartment with no doors between rooms.)