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Home Made / Secondary burn question

« on: January 16, 2013, 07:42:33 AM »

Ok, I've been planning to build a Garn style wood boilder for quite a while. I have the shop, I'm a welder by trade, I've researched how it works and have worked out the dimensions. I've seen Petemoss and Canuck's builds and I've been just waiting for the right sized tank to come along to use. I've found some used tanks, but there either too long or too small of diameter. Anyway, my question is how does this design achieve secondary burn? I understand that it has a refactory insulated secondary chamber, but doesn't it need to have air injected into the secondary burn chamber? All I see is where air enters the firebox around the collar of the door. Shouldn't some additional air be piped to the secondary burn chamber? Maybe I'm missing something.