Internal Ventilation and Walkways Return to Gallery Internal Altair Louvre Windows can cleverly control ventilation throughout the house. Altair Louvre Windows allow fresh air in to circulate the room even when the door is closed. Altair Louvres offer maximum ventilation for their size and can fit almost any space available. The tight sealing of Altair Louvres on internal walls means conversations can remain private. Altair Louvres on opposite walls allow cool air to flow in and hot air to escape quickly.