6 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector

Stops outside air from coming into the dryer. Easy to install, ensure you get the airflow direction correct.

Wasnt avail at big box stores near me so I scrambled to order this for my contractor installing the ductwork for my new kitchen stove vent. He said it was perfect and easy to install. It seems to be working great and our city inspector specifically went out of his way to check it. Passed without issue. Recommended.

Works great. Easy to install. Even easier to order since this size of damper seems harder to find at the big box stores.

Perfect for what I needed; my bathroom exhaust fans, although they have their own dampers, leak outside air into the house as if the vent was wide open. This was causing some major condensation issues so I decided to try these dampers. So far, I have noticed a huge difference with absolutely no outside air leaking into the fans. The quality is pretty good for the purpose it serves; however, one of the springs on one damper was much looser than the other damper so I did shave a star off for obvious lack of quality control. Overall, this seems to work really well for me and I would recommend these dampers for those in the same situation as me.

Perfect for my installation. Too many of these type dampers have very stiff springs and it will not work with low CFM air flows. These are great. You can blow at them with your mouth and get them to open. And they seal very well. I use them for air circulation between rooms with fans set to about 60 CFM. The last ones I got restricted about 80% of the air. These only restrict maybe 10%. This is key for low CFM situations like bath exhaust fans, for instance.

Excellent quality, good price, and easy installation.

Does what it’s supposed to, stops the draft. Makes no noise and was easy to install.

It is a light weight damper with spring loaded doors, half the price of local box store it fit fine

it works very well...no more cold air in my kitchen.

Perfect fit. Flap works nicely

Good price, seem decent quality, springs haven't jammed yet

I have allergies and apparently if I leave my portable Danby AC connected to the Window I wake up wheezing with Asthma or rather a type of bronchitis that fills my lungs with mucus from the allergies. Coughing and wheezing throughout the night. I had no idea that a backdraft damper existed or at least I could imagine that it existed but I had to search for "AC Duct air Blocker" to find that what I was looking for was a backdraft blocker. Measured twice the size of my Duct and it turns out that there are only three sizes 4", 6" and 8". My duct was 6.5". When my Draft Blocker arrived and I fitted it into the duct it was loosely fitted so I added a foam seal around the draft blocker and that made the backdraft blocker a tighter fit. Wasn't sure how far to push it into the duct but on the first try I decided to just have it near the entrance of the duct and that should be good enough. Checked that it was closed when my AC is not on and checked that I had Air flow when I turned on my AC by checking outside whether there was hot air blowing out of the exhaust. Yup works wonderfully. SOOOO theoretically without the outside air flowing through my AC duct I should have a good sleep tonight. I love how that if I have a problem such as a Backdraft on my AC Duct that I could find it on Amazon.

I used this to keep the cold from coming into the house throught the dryer vent. It works great, and was easy to install. It has a foam seal instead of the hard rubber ring that another one I purchased on Amazon at almost double the price had (I returned that one because I could see daylight between the flaps and the rubber "gasket"). I deducted a point because the foam seal was not installed accurately, but Iwas able to adjust it fairly easily. The manufacturer need to take more care assembling these, as the whole point is to not have cold air leak padt it.