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Challenge accepted @clipon ?
I expect to see pics of a J with a cherry the size of a standard log fire by tomorrow morning.
NurseHolliday-
There is a decent updraft to draw the draw up the chimney with a window open (thanks for diagram @Clockwise). Perhaps the room is warm enough, I didn't have to resort to a beer can doobie to get it moving. Did notice the steam from my tea followed it up. @mdcc_tester how many steamy cups of tea compare to a log fire for spliff extraction purposes?
Attempt two went pretty well but attempt three introduced a whole new vector to contend with; nipping on the highest grade with a coffee this morning in starlet position on the floor, legs cocked, head supported and wrist flopped over coquettishly holding an elegent, ivory coloured shortie turning brown at the fat end, I was startled by a distant cooing before my draft vanished and instead of the pure sour tang of the goddess I got a cold waft of smelly old chimney air.
I think a pigeon might have sat on my chimney pot.
Maybe the convective encouragement of tea is greater than coffee? Maybe a gently grass-warmed chimney pot is irresistible to a pigeon's bot? @NurseHolliday do you suppose a larger ting ting will scare it off?
Bit worried tbh, a pigeon came down a girlfriend's chimney once and flapped around for ages and did a poo on her duvet so don't want to accidentally lure them in....
clipon
They work with convection so the hot air rising from the fire up the chimney decides the direction. Either you need a huge j to move enough air to make it work or do it while the fire is on so the chimney is in action at the time, both seem hard to do...
When the fire isn't on the chimney will likely work the other way with wind blowing down it.