The Precision Inset (HF357i) Boiler (AL357i) Ash Pan makes routine cleaning of your Hi-Flame Precision Inset Boiler much more manageable. This genuine spare part slides in below the grate to collect falling ash, preventing it from accumulating and blocking airflow. Keeping the ash pan emptied is one of the most effective things you can do for stove efficiency. This replacement part fits the original specification exactly.