These series of fans can be used as ceiling or wall fans and can be.
Connected to short lenghts of ducting. A built-in mechanical shutter
to stop warm air escaping or cold air coming in is included

Options include run on timers to keep the fan running for a fixed
period after it has been switched off, humidity sensor to turn on
(and off) the fan depending on humidity levels and a movement .
sensor to run the fan once people come into the room.