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A wooden window grill in Plaza del Conde del Real, Valencia (Spain). The structure was probably used as a stable.

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]

A similar definition is "a French term for an enclosure in either iron or bronze."[2]

Register vs. grille[edit]

In heating, cooling, ventilation, or a combination thereof, a grille is a perforated cover for an air duct. Grilles sometimes have louvers which allow the flow of air to be directed.

Grille, and control for an air duct

A register differs from a grille in that a damper is included.[3][4] However, in practice, the terms "grille", "register", and "return" are often used interchangeably, and care must be taken to determine the meaning of the term used.[4][5]

See also[edit]


  1. ^ "Grille, Grill, n." def. 1.a. Oxford English Dictionary Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009
  2. ^ Chisholm, Hugh, ed. (1911). "Grille" . Encyclopædia Britannica. 12 (11th ed.). Cambridge University Press. p. 596.
  3. ^ Sugarman 2005, p. 132.
  4. ^ a b Haines & Wilson 2003, p. 129.
  5. ^ Dearborn Home Inspection 2003, p. 80.