Hello Rindert, I like your term “grill blowing nozzle”, you definitely have an interesting gasifier design that can work on a mixture of wood and charcoal. The “main focus” is created above between the three nozzles, which the gas flow pushes down towards the outlet openings, well, here you have an additional source of oxygen for burning fine charcoal mixed with ash, which loosens this content below and the gas flow carries the ash through the outlet openings without much resistance. The essence of this method is the ratio between the size of the air inlet openings, which ratio is right for your gasifier, you will find out during use. With Fergi, the ratio is about 1:15, the lower nozzle has a 6 mm inlet opening, into which I can push a wire and thus reduce the air flow, in the connection you can see the bent wire in the shape of a loop, but this muffled the air flow a little too much (interestingly, Mr. Don didn’t notice this either) 
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