Air vents play an important role in maintaining air quality and temperature control in enclosed spaces. When designing and discussing ventilation systems, it's helpful to have a variety of synonyms and related terms at your disposal. Some possible alternatives for "air vents" include air grilles, air diffusers, air registers, air outlets, return air vents, supply air vents, ceiling diffusers, floor grilles, wall vents, and more. Depending on the specific application and context, different terms may be more appropriate or have slightly different connotations. Having a wide vocabulary of options can help you communicate more clearly and precisely about the ventilation systems you encounter in your work.