Steve,

In a past job, we used to tie multiple reflow ovens to the same blower
without too many problems.  Balancing the flows for everything is the
biggest pain.  Another reply made a point about if your blower goes down,
it shuts down your operation.  Perhaps having more than one blower would
make sense for that reason.  Some of the blowers we had were pretty long
lead time items.

For horizontal ducting, we used to put a drain tube with a sight glass at
the lowest spot on the slope.  This would allow us to see if there was any
liquid build-up, and periodically drain the ducts if necessary.

As for the toxic substances...  From my plating days, I know it is probably
not a good idea to mix an acid cleaning bath exhaust with a gold cyanide
plating bath exhaust, but I haven't heard of any deadly reactions from
soldering and cleaning exhaust mixing.  Most of the time with water
condensation, I think it is probably concentration of acids, bases, or
explosive substances (solvents, etc.) that is worrisome from a corrosion or
maintenance safety standpoint.  Perhaps your solder/flux supplier can
provide some insight / references.

Good Luck,

Dave Anderson
Medtronic, Inc.

Opinions are my own, worth what you pay for them, and do not necessarily
reflect those of my employer.

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