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Post by craypappy on Jan 15, 2018 9:10:24 GMT -8
I’ve recently finished an 8” batchbox. Its performing very well so far. I built the door with a glass panel so I can view the fire. Problem is the top half of the glass keeps getting blackened with soot. Is this typical for a batchbox? Or is this a sign that something’s not right?
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Post by pinhead on Jan 15, 2018 10:08:15 GMT -8
This is inherent in any cavernous firebox design; air velocity towards the top of the firebox is relatively low.
In most commercial wood stoves, an "air wash" is included which blows fresh air across the window to both cool and clean it.
Since the vast majority of the burn is confined to the heat riser, this is in now way a sign of deficient combustion.
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grga
Junior Member
Posts: 76
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Post by grga on Jan 16, 2018 5:35:06 GMT -8
My heater has nearly no problems with window and soot deposit (I have no air flash). If I supply enough air to the heater (it is roaring) then all the smoke travels to the port and after the burn the window stays clear - you need to observe it closely to see some very small amount of sot... But this again depends of the draw, air supply and air speed in the core.
The other think I do not know is how much air to supply to the core to have the best performance - how to be close to optimal, maybe clean window indicates too much air speed and in the core and lower efficiency? Now I try to supply just enough air that I have good intensive fire and a some roaring sound.
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Post by smokeout on Jan 17, 2018 7:34:30 GMT -8
Would it be possible to build yourself an air diversion baffle inside the door to direct the air back onto the Glass?
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Post by woodrascal on Jan 19, 2018 6:28:56 GMT -8
On my BB RMH I've used a modified woodstove as the frame for the firebox and control the primary air with the spin-wheel and use the airwash on the former stove to keep the glass clear and provide some extra control to the air that feeds the fire. I've actually run the stove with NO airwash air to see if the glass stays clear - once the firebox is up to temp, the intense heat in the heavily insulated firebox burns off most of any deposits that form on the glass.
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