It's just a nice idea behind it , but not a nice sealing. In rare condition you would have such strong wind blowing directly towards inside and then the angle of the wind. I think its helpful somehow for very special and rare case. Not ordinary non-sealed door. I used P profile for the vertical joint of the door and silicone tape for lower side. Hopefully upper part of the doors are sealed
Anyway as I like the idea, I bought it and didn't open it?