What is a good way to attach vent covers to ceiling vents in my basement?

Question

I recently bought a house and the basement was newly renovated.

The furnace and air exchangers have vents all along the ceiling of the basement suite. However the vent covers have a tendency to fall off the ceiling and onto the floor. Is there a good way to attach them to the ceiling?

The vent covers are similar to this

Answer 1

If you want to keep the existing registers you have, the easiest thing to do is to modify it so it can be secured to the ceiling. Drill a hole in either side of the register, and then put the register up in the ceiling and mark the holes with a pencil. Remove the register, drill holes at the marked locations, install drywall anchors, and then screw the register in place.

Answer 2

You have the wrong register cover for a ceiling. The one you have is a floor register, it just sits in place. You need a register like this one that screws into the ceiling.

This will also distribute the heat more evenly.