What machine is used at CN Tower in Toronto? I was there in late Sept 09 and went through one of the puffer machines before boarding the elevator to the observation deck. The process took about 5 seconds. Only part that caught me by surprise was when a puff of air hit me on the side of the head. Other than that it not an unpleasant and the security guard was 100x nicer and more respectful than your average TSO. Can't provide much feedback on how much of a bottleneck the system can be as my friend and I went during a weekday morning when there were fewer visitors. She was wearing a skirt and worried that she would be less than modest. The puff of air was not powerful enough to cause any dignity issues.