The correct answer is B) a heat circulator.
A masonry woodburning fireplace typically includes the following basic components:
A) a throat: The throat is the narrow opening above the firebox that connects it to the flue. It helps direct the flow of smoke and gases.
C) a smoke shelf: The smoke shelf is a horizontal ledge located at the back of the fireplace, just above the firebox. It helps collect and redirect falling debris and prevents downdrafts.
D) a damper: The damper is a movable metal plate located in the throat or flue. It can be opened or closed to control the airflow and regulate the intensity of the fire.
A heat circulator, on the other hand, is not typically a component of a masonry woodburning fireplace. It refers to a device or system used to circulate warm air throughout a room or building, but it is not directly related to the fireplace itself.