Plunum support sitting on ceiling joist

New hvac system in a house from the 80’s that is gutted and being remodeled.

Does anyone see a problem with this plenum support sitting on the ceiling joist like this? It doesn’t have full bearing on the surface below and looks precarious.

Here’s another angle:

Hard to tell from the pictures.

Did they get permits?

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Im not aware

If it looks questionable, referring it out isn’t a bad thing.

I mean precarious means…“dangerously likely to fall or collapse.”


You were there, I can’t see the support well enough at all.

It’s just duct board, not very heavy, if the HAU or AHU is supported, that’s much heavier.

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Any significant vibration would likely “walk” those supports off the edge of the joist.