On 4 Dec, 15:27, Adrian wrote:
Seeing that CPC have some reasonably-priced mains extractor fans in
their most recent flier - I started thinking again about fume extraction
from the soldering area in my stained glass studio....

Personally I wouldn't bother. For the sort of fume hazard you're
facing (assuming it's just soldering and not patination fumes!) a
recirculating fan with a filter is fine. However you do need to
replace those filters when needed.