It really stops air leakage into furnace.

This worked as planned. I have no issues with the item. It does keep the air from escaping out of the slot which allows for more efficient air flow into the duct system. No wasteful air in the basement.

The furnace maintenance guy told me to get this and Im glad I did. It works very well. The design makes it easy to stay in place which is due to the flexibility of the product as well as the magnetized ends. There are 2 pieces in the package - which is good depending on your furnace setup. In my case, I needed both.

I had to buy 2 to fit but it is still a great product.

This is my second time purchasing this product after it being recommended after I had an energy audit done on my first home. The product works, but beware of potential defects as the pair I received this time around did not have the end magnets sealed properly as shown in the attached photos.