Return Air Grille vs Supply Diffuser

Is this device a return grille or supply diffuser? And which duct run should it connect to?

I'm checking return air grille vs supply diffuser at [location]. I found ceiling or wall device that looks like a vent, unsure if return or supply. Is this device a return grille or supply diffuser? And which duct run should it connect to?

Flex Duct, Boots, Collars & Grilles 1st Year BLUE

Stop if

Hold point on return air grille vs supply diffuser: I have the location, photo, drawing/detail, and what I checked. Who should verify before this gets cut, drilled, covered, lifted, connected, or signed off?

Watch out

Don't assume all ceiling devices are the same. Don't install without checking drawing labels.

Check

room/grid/area
photo of condition
drawing/detail or submittal
what I already checked
what is blocking progress

Say this to your foreman

14127 return air grille vs supply diffuser flex duct, boots, grilles & diffusers blue 1 is this device a return grille or supply diffuser? and which duct run should it connect to? i'm checking return air grille vs supply diffuser at [location]. i found ceiling or wall device that looks like a vent, unsure if return or supply. is this device a return grille or supply diffuser? and which duct run should it connect to? return vs supply diffuser, grille vs diffuser, ceiling vent type return air grille, supply diffuser, return grille, supply register air vent, ceiling vent, return vent, supply vent

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