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In Reply to: fire control question posted by MaryAnn on December 28, 2012 at 18:36:13:
With the doors open the air can enter the fireplace anywhere. Air always takes the route of least resistance, which would be at the top, nearer the outlet/chimney, but much further from the wood.
When you close the doors, the air enters (probably) at the bottom of the doors making the air more available to the embers, allowing them to increase in size and flame. That is the main reason for the glass doors.
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