Rectorseal 81913 Airtec Air Diffusers

These have a nice clamp system that makes them easy to install in suspended ceiling (or in a drywall ceiling as well, I suppose). Cut the hole (over 8" diameter), insert vent, and tighten screws and it clamps it in place. Then slide the ductwork over the appropriate diameter on the connection part (typically 6" for residential), and use electrical tie (included) to attach (I always use sheet metal screws as well). Not cheap, but the convenience is worth it to me. Only issue I had was it was missing the knob for adjusting the flow, but a flat screw driver will suffice in my case (I rarely change the flow).

Simple to install, good quality

Replacement vent since it was same type we had.

I bought 2 to replace the same diffusers that were broken in my new house. The YouTube video from the manufacturer explained how to install these and it was very easy. Buy the same tools they used to install it (heavy duty zip ties and a zip tie gun) and you will get these up in no time.

I had a round duct in my kitchen that was not going to work with my new cabinet install. The duct was also to one side and not centered where the new extended kitchen was. And I did not want to move the duct because they are commercial metal wrapped.I purchased the 3 way version of this converter diffuser. I peeled off the one section so it would fit into my duct perfectly, taped it up and screwed it into the ceiling. The air flows very nicely side to side and forward, sending the air in the right direction..