A ventilation grille provides an intended air route, for example through a wall or frame. Its role belongs within the ventilation system. A visible grille alone does not establish how much air moves or the direction and purpose of that movement.
How this term relates to your project
An extension may enclose a grille that originally faced outside. Discuss how its role changes and what adjustment is required. Replacement windows can also affect existing air-supply provisions. Assess their relationship with extraction and transfer between rooms before removing them.
Request operation, access and maintenance information for the selected product. A grille hidden behind permanent cabinetry may lose its intended function or become difficult to maintain. Record its position on the current layout and services drawings alongside other components using the same space. This prevents a decorative or furniture decision from unintentionally changing the planned air route.