A-4
Check for ventilation fans in the lab area. Any fan that
removes air from the lab could cause the ICO to smoke if
the fan is removing a high volume of air from the lab.
Check cooling fans, hood fans, etc. Turn off the fan or
open an exterior door to help equalize air pressure in
the room with outside air pressure. Negative air
pressure results in air being pulled into the unit via the
exhaust tube.