Yes! Flair is an official ecobee integration partner. Flair integrates with all ecobee smart thermostat models, and ecobee SmartSensors.
ecobee SmartSensors can be used as the temperature-sensing device in a Flair room to automate Smart Vent operation.
For ecobee customers whose thermostat is registered in the ecobee Smart Buildings platform instead of the retail platform at ecobee.com, please see the following to integrate your ecobee with Flair.
Since your thermostat is registered with the ecobee Smart Buildings platform, not the residential platform, attempts to integrate with Flair will fail until you do the following.
The solution is to use ecobee's “Tenant Mode”. This allows the thermostat to remain in the Smart Buildings system while also being registered in the residential platform.
Tenant Mode must be enabled by the property manager. They will need to open the SmartBuildings app, click on the thermostat in question, and find the "Tenant Mode" toggle under "More Actions."