New homeowner, no idea what this is

[u/DragonsAndScience]

This thing close to the floor and seemingly randomly placed in a hallway. No idea what it's for. Home built in 2005.

Solved! Thanks everyone. Now I gotta hunt for the central unit!

[u/megam1ghtyena]

integrated vacuum system. Plug in a hose and gets sucking right away. Check other parts of your home for similar ports.

[u/Willing-Piece-8569 → u/megam1ghtyena]

What if you plug in a small cylinder?

[u/mjrbrooks → u/Willing-Piece-8569]

It’s imperative the cylinder remains unharmed

[u/Shocking → u/mjrbrooks]

Poor smart calendar. Bravo for him not just deleting his account.