When inspection doors on the wails of boilers are opened, flame does n

1.	When inspection doors on the wails of boilers are opened, flame does not leap out because:
A.	These holes are small
B.	Pressure inside is negative
C.	Flame travels always in the direction of flow
D.	These holes are located beyond the furnace
Answer» D. These holes are located beyond the furnace

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When inspection doors on the wails of boilers are opened, flame does not leap out because:

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