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Old January 17th, 2015, 05:04 PM
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Default AOF Build

Was considering installing AOF on my 5x16 arch. The spects say two rows of nozzles for a 5 foot wide arch 6 inches below the arch rail.Which set of nozzles get put at 6in?.Are the nozzles supposed to blow over the fire or at it?. Also with 8in drop flues how much of them get covered with the back manifold?.
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Old January 17th, 2015, 05:20 PM
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Every 6" along the firebox, I'd stay away from your flues. I assume the top row is 6" below the rail. If using 3/8" pipe, drill an 11/16" hole and you can set the angle pretty close to 10 degrees down by hanging the pipe in the hole with the smallest amount of that 3/8" pipe going through the hole.
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Old January 18th, 2015, 03:58 PM
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Anybody out there with AOF using just side and front nozzles and does it work that way?.
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Old January 18th, 2015, 04:05 PM
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Any secondary combustion air will help. Even if it ups just sides. Or just back.

Only downfall I see to having front with no back is it could effect the boil in the very front of the front pan

Also, make sure you dont blow cold air on the pan botton.
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Old January 18th, 2015, 08:18 PM
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Hi, Our rig is smaller its a 3 x 10.
We are using AOF on both sides of the syrup pan and across the front of the arch. The nozzles are about 6 inches apart. I think the nozzles are 1/4 inside dia. They are pointed down towards a spot at the center of the rig about 10 inches above the grates.
I chose to build a top rail system rather than work inside the finished arch. So this AOF system sets on top of the rails and raises both the front and rear pans 2 inches. Used 2 inch square stainless steel tubing and fastened it to the top rail. Air enters both sides of the AOF tube at the back of the arch. Is heated as it moves towards the front.
I think it works real well to burn the gases in the upper part of the fire. We get almost no black smoke from the stack compared to prior to AOF.

Hope this helps,
Regards,
Chris
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Old January 19th, 2015, 05:57 AM
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Sugarmaker Does your front nozzles stop at the side of the door or does it go all the way across?
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Old January 19th, 2015, 09:41 AM
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Maple Hill,
I think there are 5 nozzles across the front of the arch. which are above the door also.
I have some pictures somewhere.
Here is one that might help you understand my system for AOF.
Looking back towards the flue pan.


From the left side of the rig. Note there are no nozzles along the flue pan


The air enters from the round vertical tube at the back of the arch.


The air inlet is the 2 inch pvc and the ball valve coming down, under the arch to the center then branches back to both sides and up to the top rail.




Hope this helps you understand how I built this. I know this is not the recommended specifications for installing AOF, which is 6 inches below the rail.

Regards,
Chris
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Old January 19th, 2015, 04:45 PM
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Thanks Sugarmaker nice build. Does the front of the pan boil like it should & what style pan do you use. Also was wondering how you hook your front & back pan together,didn't see any fittings.
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Old January 19th, 2015, 08:47 PM
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Maple Hill,
Your very observant! This was a day when we did a trial fit of the new flue pan. The fittings were cut in later by the fab shop.
Here are several pictures of the finished pans.
(its a 5 foot reverse flow)









Regards,
Chris
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Old January 19th, 2015, 09:02 PM
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Default Found the pictures I was looking for on the AOF TRS

Just to add to the confusion and the pile of pictures which is what I do best. Some of the details of the AOF TRS built fall 2014. Unconventional system. I have not used this second generation one yet, but don't see why it won't work as good as the prototype did for 4-5 years. The old one was round tubing which was much cheaper but was hard to seal up the arch and pans.











Regards,
Chris
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