Grillwork
Grille (architecture)
Grid of slits in a barrier, that allows passage of fluids but blocks large objects
A grille or grill (French word from Latin craticula, small grill) is an opening of several slits side-by-side in a wall, metal sheet or another barrier, usually to allow air or water to enter and/or leave and prevent larger objects (such as animals) from going in or out.[1]
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A similar definition is "a French term for an enclosure in either iron or bronze."[2]