Product review (5 stars): Nice heavy duty dryer vent
Nice heavy duty dryer vent, really old school.  Seems like it will actually last longer than my previous aluminum one.  Vent flap has small hole through which I added a small ss bolt with ss washers to add weight and help the flap stay closed.  I do not like having a 4" hole in my wall for the heat or cold to enter the house.  Works great so far.