Product review (5 stars): A Must-Have Dryer Vent Accessory
This wonderful contraption now replaces my contractor-grade louvered dryer vent. I live in Minneapolis and the winter here are cold--sometimes VERY cold. Over this past winter, I especially noticed that the metal dryer duct in my basement laundry room was quite cold to the touch. I've been making a number of improvements to the home over the past year around air sealing and insulating. All of the work has proven worth the effort, but when it came to the dryer vent and how I could reduce cold outside air from coming into the home, I was a bit stumped. Until I found this.

Knowing that UV light would eventually break down the plastic, I began by prepping it for paint. I used steel wool to scuff the surface, then sprayed it with plastic-compatible paint that I had on-hand. This paint serves as a primer for the flat outdoor latex paint that will be applied later in the summer. Once it's applied, the vent color will match the house's paint and won't stand out as it does in the attached images. I constructed a shim using a section of 3/4" pine board, allowing the foot of the elbow to have a totally flat surface, allowing a strong seal with the house's siding.

Also, I removed the mounting bracket from the removable top because the pitch of the siding didn't allow the top to sit on properly. It's no matter, as the top sits on very well and seals solidly simply with the press-fit connection. I don't have any concerns about the upper chamber or the lid coming off from high winds or storms. You really have to give it a solid tug to get it to come off of the elbow base.

Highly recommended. It's not cheap, but it's the best thing I've see to do this job. It's the summer now, so I can't make any comments about whether it fully stops ambient air from entering, but based on the design, I'm fully confident it'll do its job as designed.