The Precision I (HF905)I (HF907)I (HF910) Boiler Grate Frame is a genuine spare part for the Hi-Flame Precision 3. It holds the grate assembly in the correct position inside the firebox, providing the structural foundation for the combustion system. If the frame becomes damaged or warped, the grate cannot sit correctly. This replacement part is made to the original specification and installation is straightforward.