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How come air flows in under the fuel shelf?

 
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Hi

According to this image, air intake is supposed to flow from below the fuel shelf:



Why is this the case? Air would also flow in from above the shelf - right? In fact, wouldn't most of the air flow in from above since that's where the flame is (shortest distance)? Air would need to take a longer route if it comes in from below the shelf.

Thanks
 
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Air comes above and below the shelf. But above the firewood blocks the tunnel partly, and the air takes the path of least resistance, under the shelf.
 
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