Hearthstone OEM Part 2010-025 Lower Base Ash Grate #41 in the above schematic
The #2010-025 is designed for use with the HearthStone Equinox 8000 wood stove only and sits below the upper ash grate that you can see from inside the firebox
Prior to loading the stove, ensure the ash grate and the ash compartment door both are closed. If left open, the stove will over-fire and will suffer damage. Do not burn the stove with the front or side door, ash compartment door, or the ash grate in the open position.