I think the cell would get drafty--the poster would also be prone to vibrating from the air current rushing in. They could probably have stuffed some fabric in there to suppress it though.
"Learn from me, if not by my precepts, at least by my example, how dangerous is the acquirement of knowledge and how much happier that man is who believes his native town to be the world, than he who aspires to become greater than his nature will allow." Frankenstein
