Posted for "Zavatson, Christopher J \(US SSA\)" <Christopher.Zavatson@baesystems.com>:

Marv,
I should have mentioned that only brushless motors should be used. The
explosion thing was a big concern. Even for the number of lights in
room. All lighting was on the outside of the plastic. On an industrial
scale with big fans/motors only positive pressure makes a lot of sense.
One can buy fans/motors rated for explosive environments from the likes
of Grainger. -expensive though.
Where did the photo dissappear to?
Chris

[Sorry, photo re-attached.   <M>]