Hi,
I installed those for my old house and i wouldnt recommend them coz it will become loose after a while, my girl can actually still stick her head out.. Alas, as i live near the sea, the fine steel (suppose to be stainless) still rust and my hubby in his fustration removed the thing, it cost us 1500 to install them (only 4 or 5 wires)..
However, i must say that it looks really invisible and people cant tell that i have grille in the living room.
I hope it helps in your decision.