Door lets in absolutely no air.

I just wanted to let you know how happy I am with the dog doors I purchased from you. I initially bought the one that fits in a door, and was extremely impressed. We have had some very cold temperatures and high winds, and that door lets in absolutely no air. I really wanted to be able to use your dog doors for my kennel also, but the house was built for our existing dog doors in walls with 2×6 construction. I bought your basic dog door and built an “entryway” on the inside allowing enough room for the flap to open so the dogs could exit the original opening in the wall. It worked perfectly! In the past, I had to put up temporary fencing strung with blankets and foam padding in the winter, and still couldn’t maintain a comfortable temperature. With your door and my amateur construction, the kennel is extremely comfortable. I just ordered another basic dog door to do the same in my other kennel. Thank you so much for making such an awesome and efficient product!