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oof is not glazed and the south wall is vertical rather than sloped. The state -of-theartsolarium is sometimes a two -storey space, with French doors opening to roomson both levels, allowing better circulation of solar-heated air throughout the house.Figure 11: Orientation to true south in a passive solar house may vary by as much as 30 degreeseast or west of south with relatively little loss of o verall efficiency (top); A direct -gain system, such as349

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