Product review (1 stars): Design and construction need improvement
Saving energy by venting an electric dryer into the house is generally a good idea.  However, this product is a poor choice due to cheap construction.  In the summer position it leaks a significant amount of hot moist air into the house causing a extra load on the air conditioning.  Leaking air is due to the flap leaving almost a  inch gap when in the summer position.  In the winter position the flag is also a poor seal.  I believe using this product would increase energy consumption, not lower it.  There are must better products available. One I found to be much better is the Deflecto Ex12 Heat Saver & Lint Trap.