What is this?

[u/NerdyAutistic]

This was installed into our in ceiling heating/air unit over night at my job. It was never been there before and my coworker was panicking and making a fuss about it.

[u/No_Arachnid6493]

Looks like a newer version of this:

https://www.mitsubishicomfort.com/products/p-series/slz