it has to build a positive pressure in the hopper as long as the chimney is cold. Once heated, the gases are evacuated and the nozzels suck in fresh air. 
Itâs great, I love this technology 
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Well the chimney is never realy cold becouse its surrounded with hot sand and the heat accumulates a couple of days.
If the hopper lid is opened just a couple of mm it draws air in so about half of the air is drawn in trugh the top and half from the bottom.
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Thatâs what I call fine tuning 
If your kiln behaves simular to my downdraft boiler I think you will discover it will burn a little different every time. With proper tight stacking char wonât climb much up into the stack. With crocked wood or some criss-cross airgaps you will probably ashive the best result for your purpose.
I hope your peperonis can stand their new climate
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Indeed, the criss-cross pattern is what l do. Actualy l just toss the logs in not fun doing any stacking in a red glowing metal boxâŚ
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Hi Kristijan,
this heater is a great idea for using the otherwise wasted heat during charcoal production, plus it is able to be run continuously. Very inspiring and thanks for sharing it!
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Hi Til! Havent heared from you in a while. Whats up in Germany?
Eaven thugh wood is free l still feel bad wasteing the heat.
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Hi Kristijan,
yes, I havenât posted for long but still checked DOW from time to time to see whatâs going on.
Iâm doing well, but due to family and work there is no progress yet in my case 
Well I hope this will change next year and doesnât end up like other good intentions for new years eve 
I would also feel bad wasting the heat, thatâs why I like it!
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Hi Kristijan
I repair my greenhouse and I take advantage of this to install a wood heater like in your greenhouse
for the flue that passes under the cultivated soil (about 6 meters in my case)
I thought about installing an old iron pipe of 6 or 8 shoots
According to your experience is this a reasonable diameter?
what diameter of chimney have you buried in the earth of your greenhouse?
Thierry
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6 meters? That is close to 20 feet! If you heat it in the fall that should last all winter
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Hi Thierry, good you got to it! Be sure to burry it deep.
I am not quite sure what you mean with 6 or 8 shoots. Culd you put it in cm or inch?
Wery good idea on steel pipe. This is the only mistake l made, l put in a 5" wood stove enamel chimney pipe. Its put together in 1m sections. No good! Moisture creaps trugh the seams, dust, heat and soil pressure cripled it.
It is wery important to make the flue easyealy reachable for cleaning. It will collect tar when fired cold and later when heated up it will collect dust. Allso make a âlighting hachâ to aid you at startup. Just light a bit of newspaper to create draft.
Ha, Don, not far from the truth. I fired it up before winter for a few days non stop, the sandstone cellar wall some 6 feet away from the burryed heater was warm.
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Iâm talking about diameter in inches (google translation do not like spelling mistakes )
thanks for the advice to make me think about access for lighting and maintenance
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