wall grille

wall grille

[′wȯl ‚gril]
(building construction)
A perforated plate or a framed structure composed of rods or bars that is used to cover a wall opening to restrict vision but allow movement of air.

wall grille

A perforated plate, casting, molding, or framed bars or rods to cover a wall opening, radiator enclosure, etc., restricting vision but permitting the flow of air.
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Once, I vividly recall a scamp from up the street making some unscheduled amusement of his own by breaking away from our garden fireworks party, cramming a banger into a wall grille at the back of our house and.
Normally airflow passes though wall grilles or gaps under doors.