The Charnwood C-Four is fire brick lined and can take a log length of up to 282mm (11”). With a rated output of 4.9kW the C-Four, in certain situations, can be installed without the need for external air. This stove meets Clean Air Act requirements for smoke control exemption; allowing wood to be burnt in smoke control areas. Specifications Energy efficiency - A Efficiency - 78.3% Nominal heat output - 4.9kW (Range 2 - 5.5kW) Product measurements (cm) Height - Low legs (Height of stove 56.0cm) Store stand (Height of stove 71.0cm) High legs (Height of stove 76.5cm) Width - Low legs (Width of stove 38.6cm) Store stand (Width of stove 38.6cm) High legs (Width of stove 40.0cm) Depth - 29.2cm Weight - Low legs (Weight of stove 83kg) Store stand (Weight of stove 89kg) High legs (Weight of stove 85.5kg)