Interesting.
you'd need to watch it, though, - the N2 rich air is only at the floor because it's cooler. N2 is marginally less dense than air, all else being equal, so it's really the room vents that matter.

I'm surprised by the amount in both yours and Boris's posts though - I can trigger a full 02 alarm just by mis-filling a small storage dewar, although all our labs run odd sealed air handling systems to be fair.
( the mighty badger Aphrodite, on a bar stool, by your side, Wed 21 Sep 2011, 14:05, 1 reply)

Sure
It was the coolth what done it. It was just a normal office, so no alarms of any sort. None in the helium labs either - you knew something was leaking when your voice went funny. Seriously.
(ubergeekian, Wed 21 Sep 2011, 16:36, closed)