Use cases  
*Fresh air entry for ventilate rooms and Generator  Disel rooms.
* to be used for  Decreasing  pressure between two spaces.
* to ben instal on the wall , door , and window.
Abilities

* Able to be make of  Alominium sheet , Galvanize , steal stainsel
*prevent  to enter water and snow in to bullding
* possible to be instal net brid Keeper .
* high solidity in regard to special wing from
* Able to be instal agostic  for  absorbing  environmental  noise (agostic Lover)