Return Air Grille vs Supply Diffuser
Return and supply devices look similar but function differently. Installing wrong type affects system performance.
What You Might Be Looking At
ceiling or wall device that looks like a vent, unsure if return or supply
Apprentice words: air vent, ceiling vent, return vent, supply vent
Trade terms: return air grille, supply diffuser, return grille, supply register
Check First
What Not To Do
Don't assume all ceiling devices are the same. Don't install without checking drawing labels.
What can go wrong: Poor room air distribution, short-circuiting, temperature control issues, occupant complaints
Better Foreman Question
Is this device a return grille or supply diffuser? And which duct run should it connect to?
Verify With
Reference type: project drawings
Source to verify: Project HVAC plan, reflected ceiling plan
Safe wording: Return and supply devices are not interchangeable.