In Heating and Ventilating and Air Conditioning
In heating and ventilating and air conditioning for room air distribution, a grille, specifically spelled with the ending e, is a class of air terminals. Most HVAC grilles are used as return or exhaust air inlets to ducts, but some are used as supply air outlets. Diffusers and nozzles, are, for example, used as supply air outlets too. Registers are a type of HVAC grille that also incorporates an air damper.
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