Hearth: the hearth is the floor of the fireplace, providing a fireproof area on which to build a fire. Generally composed of brick, stone or cement, the hearth extends beyond the firebox into the room providing a layer of protection for your home’s floor.
What Is the Bottom of a Fireplace Called?
The bottom of a fireplace is called the ash pit. The ash pit is where the ashes from the fire fall. The ash pit is also where the air intake for the fireplace is located.
The air intake is a hole in the bottom of the fireplace that allows air to enter the fireplace and mix with the gas and smoke from the fire.