Balanced flues work in conjunction with glass fronted gas fires. The Appliance is completely sealed from the intothe room which it is installed. This means there are no draughts and heating effeciency is increased. The twin wall pipe vents directly to an outside wall. Air for combustion is drawn in through the outer pipe, whilst the inner pipe removes the combustion gasses to the exterior of the property. Another benefit is that the BER energy rating is at its highest on a balanced flue gas fire as no wall ventilation is required to the room.