Abstract: An air distributing device, for a fireplace that is equipped with an air conduit which can conduct outside air to that fireplace, has a lower air-guiding section adjacent the bottom of the fireplace opening, has an upper air-guiding section adjacent the top of that fireplace opening, has an air inlet in that lower air-guiding section which can receive outside air from that air conduit, has a plurality of air outlet ports in that lower air-guiding section and has an adjustable air-throttling means to control the amount of air which can pass from those air outlet ports into the fireplace, and has a plurality of air outlet ports in that upper air-guiding section and has an adjustable air-throttling means to control the amount of air which can pass from those air outlet ports into the fireplace.