Just thought I'd share a solution I found online for ceiling vents.
My 4x10 ceiling ducts only have wood behind one edge, and so I was only able to use one screw to mount the Flair vents (sag, poor seal when vent was closed).
I was initially just going to use drywall anchors in the ceiling, but being so close to an edge, would not have worked.
Because of the finished ceiling and tight working space, I drilled out the vent rivets, then bent the duct so I could attach a bracket. Screwed it all together, and seems to be holding well.
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