16f air - OMG. When I did my ow certification at 49f and I thought that was tough. Almost embarassed to admit it now. What really amazed me was the fact that it took 33lbs of lead to get me under. I recently bought a very nice DUI Drysuit and man what a world of difference. If you are going to buy - do your homework, they are expensive but a good one will last for years to come.
Dive safe!