"ventilation grille" is correct and usable in written English.
You may use it to refer to an opening in a wall or floor that allows air to be exchanged between two spaces. For example: "The ventilation grille in the wall allows air to circulate from room to room."
Rather quaintly, prisoners in adjacent cells are permitted to have conversations through the ventilation grilles.
In these cases, passive ventilation grilles are a cheap and effective solution for the ventilation.
The fissured sides also conceal ventilation grilles and service openings, from which cranes can emerge like robotic arms to clean and maintain the building.
This work deals with an in-depth experimental analysis about the air permeability values measured over a set of passive ventilation grilles available on the market.
Eurostar services ground to a halt because particularly fine snow falling in northern France was able to get through membranes behind ventilation grilles on the locomotive which are fitted for winter use, the company said.
In the changing room afterward, the ventilation grilles howled and wheezed as though the building were alive, a huge beast full of rooms, corridors, and shafts that had settled here beside the school and in its despondency sang lonely laments.
Then he covered the openings with louvred aluminum screens that looked like ventilation grilles but were actually observation vents that allowed him, while he knelt in the attic, to see his guests in the rooms below.
From the decorative, fake ventilation grilles set low down in the walls to the suspended ceiling of flip-flapping white metal shapes hanging beneath the lights, casting a dapple of geometric shadows over the walls, it is a good place to be.
From the parametric study it has been inferred that the main parameters affecting the ventilation of the substations are the pass area between the LV MV zone and the transformer zone, the surface area of the ventilation grilles in the substation with horizontal ventilation, and the perimeter of the protruding ventilation vents in the substation with vertical ventilation.
