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

We recently bought a house and once it got into spring I started noticing condensation on the dryer door and little puddles inside the dryer because it’s so humid here. This immediately stopped any condensation inside the dryer thankfully! It was easy to install and took about 5 minutes- we attached it to the dryer hose with zip ties. Once installed I haven’t noticed any condensation on the dryer door or inside the dryer! The only thing I’m concerned about is eventually needing to removed it to check for lint build up around the ‘door’ that opens and closes but even if there is lint I’m happy there’s no more moisture inside the dryer

It does not needs to be cramped to fit a 6 inch pipe

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.

Although the documentation said it would work in a vertical installation, that didn't work for me. The spring controlling the damper blades was too strong and it barely opened when my 250 CFM range hood was on high speed, using 6 inch stack ducting. I used some snippers to cut the spring out of the damper and just rely on gravity to close the two doors and it worked perfectly. The housing is rigid enough to maintain its round shape to prevent binding of the damper doors. It has some foam strips which help the doors seal very nicely.

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

These are perfect for routing multiple bathroom fans to a common roof vent. The springs and doors are light enough to allow for easy opening with air flow.

It is essential for protection against insects and the wind.

falls into 4" pipe didn't help with condensation in dryer when it's hot and humid outside

Je suis très satisfait

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

Fit into existing pipe was a little loose, but the valve works very well. Sealed with duct tape.

Excellent design, construction, and workmanship. The shell is made of rigid sheet metal and the butterfly dampers of aluminum. The dampers are normally held in the closed position against the seal by light springs. The dampers open in one direction by just blowing against it. Both ends of the shell fit perfectly inside 4 inch diameter ducting. The plain ends allow it to be easily installed in an existing ducting that needs a backflow preventer. It even had a sticker noting how to orient the dampers properly when installing it horizontally. I used it to prevent wet exhaust from our clothes drier backflowing to our washroom. Both drier exhaust and washroom vent were tied to a tee that exhaust to the outside. Our washroom vent fan damper was not enough to keep moist air from our drier from backflowing into our washroom.

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.