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This is a cutaway drawing of a single storey house. It is seen looking down obliquely on the roof. At the top left the sun is shown shining down on the house. There are a number of broad orange arrows emerging from the house showing the heat losses. There is a chimney rising from the centre of the roof. An upward pointing arrow is emerging from this, which is labelled ‘flue loss’. To the right of this is another upward pointing arrow labelled ‘fabric loss through roof’. A section of the roof is cut away to show horizontal ceiling joists with insulation between them. At the left of the house a horizontal arrow pointing to the left is shown emerging from an external wall. This is labelled‘fabric loss through walls’. Inside the house at the left the interior of the kitchen can be seen through a cut away wall. Inside the kitchen a cooker can be seen. A horizontal arrow indicates heat emerging from the oven into the kitchen. The kitchen sink is also shown with a pipe descending to a labelled ‘main sewer’ beneath the house. An orange arrow running parallel to the sewer is labelled ‘water loss by hot water’. Also running parallel to the sewer is a labelled ‘electricity main’ and a labelled ‘gas main’. At the right of the house the interior of the living room can be seen through a cutaway wall. In the centre of the house a coal fire is shown. A horizontal broad arrow indicates heat emerging from this fire into the room. Other smaller arrows show heat emerging into the room from the chimney breast. To the left of the fire is an electric standard lamp. Small arrows indicate heat emerging from this into the room. A small cat is shown sleeping in front of the fire. Small arrows indicate that the cat is also warming the room. A vertical downward pointing broad arrow penetrates the living room floor and is labelled ‘fabric loss through floor’. At the right of the house a wall is shown with two windows and a door. The larger of the windows is shown closed. A broad horizontal arrow is shown pointing to the right and labelled ‘fabric loss through windows’. The smaller window is shown open. Another broad horizontal arrow is shown pointing to the right labelled ‘ventilation loss’.

 2.1 Heating a house