This is an easy heat way with channellings of air to force and speed the air is aided by valvular conduit (N.Tesla called it) which are exactly what da Vinci and the Chinese drew down many years before. The flow then goes around poles or rods to act as venturis to cause vacuum pressure on the side away from the wind source and so speed the flow of the air extemely well. Two venturis is a max amount if in line with each other. The flow goes past flat pieces in the path that heat up that and it burned.the air very quickly.
It put the flame to a 2 inch heght almost. Then another from a bigger strip on it and a blowtorch ensued about two to 3 inches tall and cut off like flat with a knife. I made a blasting noise as it burned. I should include some stories about venturis. I was in a tent in snow and put a candle together with a small ring from a short strip of metal that went around a very small candle flame. Anymore venturi and the whole tent was a blast of shortlived flame for a sec.
This venturi idea was easier shown with three sections of straw and 5 coffee stir stick (sections of)between and around those set on three stiring sections ten or fifteen inches long. A breath of air so little I could bareley notice it and it burned my finger before I could pull it away, less than a second.

Maybe his is talking about the Bāguà—The eight trigrams???

PC

(EDITS: There is an actual 'direction' associated with those things and there are earlier and later 'heaven' versions!)