Product review (4 stars): Excellent design but tricky to adapt to existing duct.
I have had a couple conventional dryer vents which always stuck partially open and then the cold air can be felt at the dryer especially at -10 in Minnesota. Actually, it helps provide fresh air for my furnace but I already have a proper fresh air vent for that. Who knows what else may be entering. I like the design and it works as it should. My only problem was adapting it to the existing ducting. My duct wall adapter had the vent molded onto the round duct. I could not find a wall duct with a flat flange. What I did was cut off the flapper vent to create a flat flange for a flush connection with the Lambro vent. After the flange was resolved installation took about 5 minutes. I will update the review after I check performance this winter.