We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember The Natural Philosopher
saying something like:


Those fans look like they simply stir the air around the boiler, They do
not work in the flue at all. I think they should be quietly filed under
'Green********' along with solar volatics on the roof, windmills on te
roof, CFL lightbulbs...

They do actually work in a small space, like a narrowboat cabin. Be
utterly useless in a larger room, iwt.
--

Dave