Gogs wrote:
Oops is there an edit on here, also meant to say the Lux air seems to
say 'Please Note: Chimney Stack with vent must be used when
recirculation option is used'

I am not able to use ducting, so what does this mean exactly?

Luxaflex are saying that you should use a chimney stack with vents
(i.e., holes covered by a grid) if you want to re-circulate the air.
You should use the charcoal filters if you do this - they are supposed
to remove the cooking smells.

Get the brochure, http://www.luxairhoods.com/downloads/brochure04.pdf,
and look at page 7. The diagrams of the chimneys have little black
rectangles on them. These are the vents.

Obviously, if you send the hood output to the outside world, you don't
want to have the fumes coming back into the kitchen, so in that case
you don't use a bit of chimney with a vent!

Hope this helps

Alex.