We have a unit heated by a gas blower with a large fan in the apex approx
20ft high.

I want to break the place up into separate 'rooms' for a better control of
noise/dust etc. but I reckon that the heating of the place will become a
problem.

The best I can come up with is to have expelair type fans fitted into the
ceiling the wrog way round to draw air in.

Any opinions/ideas?

Cheers,

Rick