Ignorant guess: so that the flammable vapors won't escape, and possibly
catch fire.

As to fusel oils, not a big deal. Circuit boards won't complain of hang
overs and head aches. Might even help clean the boards.

..
Christopher A. Young
Learn about Jesus
www.lds.org
..

On 9/9/2013 9:33 PM, Joe Gwinn wrote:
I've seen copper-coil condensers run through a bucket of water that
will cool and condense the outlet to negative pressure. You just have
to pour in cold water from time to time, and let the excess flow over
the side of the bucket. That's what the gooseneck is for -- to tell
you when you're getting positive pressure and you need to pour cold
water around the condenser.

Why do you want negative pressure, given that ethanol won't decompose
from the heat at atmospheric pressure?

Joe Gwinn