Paul

I installed the blower on my unpressurized IV.  I installed it at the very rear of the overhead with a flapper valve that lets me close it for winter operations.  It is behind the rear closeout.  I can't tell you how good it's going to do in the summer as I just started flying two weeks ago.  I can tell you that it has already been helpful in defogging the windows before takeoff when it was about 40 degrees and real humid.

Tom Byrnes Lancair IV N54TB