The lower duct passes underneath the boiler floor and is connected at the front to a ____ which distributes the air to a number of burners.

The lower duct passes underneath the boiler floor and is connected at the front to a ____ which distributes the air to a number of burners.

The lower duct passes underneath the boiler floor and is connected at the front to a ____ which distributes the air to a number of burners.




A. Windbox
B. Louver
C. Air heater
D. None of the above



Answer: A


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