Energy Saving Dryer Vent Closure

It’s the best design to seal off the elements and has no parts that can fail or not seat right to make a good air tight seal for letting cold air in during the winter and cold out in the summer to keep the bill lower. All homes should be using this type. My prior hime I sold came with tis design also and was the first time I’ve seen it and I liked it so much I search for one for my new home that had the standard tyke all homes have and it leaked Ari like a sieve and made my basement so cold. This was the perfect fox do that and I’m very happy now to not be cold down stairs and waste my money on heating to compensate a bad design that is not fail proof as this is.