炉床面

Grate \Grate\, n. [LL. grata, fr. L. crates hurdle; or It.
grata, of the same origin. Sae Crate, Hurdle.]
1. A structure or frame containing parallel or crosed bars,
with interstices; a kind of latticework, such as is used
ia the windows of prisons and cloisters. ``A secret grate
of iron bars.'' --Shak.

2. A frame or bed, or kind of basket, of iron bars, for
holding fuel while burning.

{Grate surface} (Steam, Boiler) the area of the surface of
the grate upon which the fuel lies in the furnace.