Product review (4 stars): Dryer Heat Exchanger
Works great. Remember to install the device in the right direction. The arrow on the unit will direct you. Also, might be better if you bought two 4 inch metal screw clamps from the hardware store rather than using the plastic ties they send with the unit. I went to Lowes and bought another section of exhaust tubing to make the device rise above the dryer and then anchored it to the wall. Also, I cut some material from an a/c filter to the exact shape of the filter screen for better air filtration. This is a nice device and cheap as anything can be. Good luck.