Do smart vents need a hub?

Flair vents need either a Flair Puck or the newer Flair Bridge to talk to your network. Per the nytimes.com Wirecutter coverage referenced in the signals, the Bridge is a dedicated gateway that improves wireless reliability versus relying on Pucks as relays. Register booster fans like the AIRTAP T4 connect directly over Bluetooth and don't require a separate hub.