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Old December 28th, 2011, 08:28 AM
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I have my arch ripped apart so I can had a furnace blower for air under the fire. Should i add air over fire also? its a 2x4 oil drum arch and I probably will be upgrading next year but would like to improve the gph rate. what do you guys think?
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Old December 28th, 2011, 09:22 AM
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On a 2X4 I wouldn't bother with the effort and expense. AOF helps to reduce your firing times and save firewood, but in my personal opinion I don't think it would do much on a small 2X4. If you want to increase your boiling rate you're already on the right track. Finish putting that furnace blower in, crank it up, and shovel the firewood in as fast as it'll burn. Keep your firewood split small and you should see the sap try to crawl right out of the pan.
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Old December 28th, 2011, 03:02 PM
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Speaking as a outdoor wood boiler dealer ( Heatmor) i can say that for our gasification boilers we use 80-20 for our forced draft. Meaning 80% of the air is delivered under the fire and 20 % is delivered over the fire for combustion. If you have enough space between the grates and adequate air volume you should be able to achieve both aof and auf with the blower under the grates. Now not at the the same degree as true gasification unit but close enough for me.
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Old December 29th, 2011, 08:47 AM
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Default AUF it is

Thanks for the feed back guys, I figured it was a waste of time on this rig. I have 1 inch between my grates and I'm redoing them so I can open them up a little more and get the air swirling around.
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12x15 sugar shack
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2010 15 taps
2011 70 on tubing and 45 buckets
2012 shooting for 200 total
Three sons and diesel our German short hair
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Old December 29th, 2011, 01:28 PM
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1 inch between grates is enough if you have good draft and certainly more than enough if you and any blower at all.
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Old December 29th, 2011, 07:12 PM
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I agree with Riley, One inch is plenty anymore wood and coals will fall down into your ash pan.
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