Notch

The rebate diffuser is installed only in the upper area of the windows. Fresh air from the outside is supplied to the space between the sash and the frame, there the pre-heated rises up and flows into the room through the diffuser. There is no draft phenomenon, because the outside air is directed through the air inlet and the upper rebate to the ceiling, where it mixes with the warmer air in the room. Available in white, anthracite and brown. Available in white, anthracite  and brown.