brianmanahan
Lifer
im trying to decide wether i want one or not
holy crap that was a dirty trick :\
But having done part of a masters on this shit, they are suppose to cut down 25% (IIRC) on air exfiltration, so you "leak" less heat. The idea is that you would close one door before opening the next.
First thing I did with "Google" images and saw the 2nd result. Wasn't really sure what vestibule is. :biggrin: