Product review (4 stars): Heartland Dryer Vent
Even though the instructions were not too picturesque I managed to decipher how this item is supposed to work. Installed it and everything works fine but if your vent tube length is long with a lot of bends they recommend an additional blower to vacate the air. The specification is longer than 15 feet with 3 or more 90 degree  bends, It would have been nice it the color were white instead of cream. The flat mount can be a problem depending on where the hole penetrates the siding which could warp/cock the crap out of it making for poor esthetics. I made a special form fitting wood backing to fit over the siding. I also installed an additional external filter along with plastic blast gate valves to route the air inside or outside to save heating oil in the winter. You can't do this with a gas dryer.
JJK