Plot hole: Accessing the secure room through the duct work would be virtually impossible (pardon the pun). First is this an air supply duct, return air supply duct or an exhaust duct? If it was an air supply or a return air supply duct there would be a squirrel cage fan moving the air. Not the propeller fan you see in the frame. If it was an exhaust air duct again no propeller fan. The size of whatever duct it is for that size of a room is questionable. The room was small yet the duct was large enough for a man to crawl through. The last reason why this would be impossible is where are all the screws that ducts are assembled with? They would definitely stick through the ducts and catch clothing, scratch hands, heads etc.
Plot hole: There is no reason whatsoever for Jim to have brought the bible from the hotel with him. Max says that Job never quotes scripture in his messages, so he has no reason to bring the bible. The only biblical reference is job 3:14, and that is simply a phrase to remember: having the bible with you will not help you remember it in any way.