A mechanical stoker is a powered, integrated system that feeds fuel and moves it through the combustion zone; a mechanical grate alone supports burning material without fuel-feeding mechanisms. Both fall under this heading when designed as part of a stoker assembly, but standalone grates or dischargers sold separately may require careful classification review to confirm they remain within this heading rather than being classified as general mechanical parts.

While mechanical stokers are industrial equipment and do not trigger food or agricultural admissibility review, large combustion units may be subject to EPA New Source Performance Standards or state air-quality permitting requirements before installation. Importers should verify compliance with applicable emission regulations independently of the customs entry process.