Jetmaster gets maximum performance from all its components. The chamber formed by the double wall around the fireplace lets in room air and channels it to the back towards a narrowed neck. The bevelled shape of the top of the firebox means the flames play against the metal, which then superheats the air accumulated on the other side. The heat thus attained is such that the escaping air immediately circulates around the room up to ten metres across the floor, bringing "every corner of your room up to the fireside".