The roof is supported by cross bars (1) and pillars (2). The ventilation panel (6) is hinged (8) to the uppermost ridge (3) of the roof. The panel is opened and closed by a screw jack mechanism. Between the edges (5) of the ventilation aperture and the edges (7) of the openable panel (6) is a gauze screen (9). The screen is formed by connected front (11) and side (10) assemblies. The gauze assemblies are made from sections with horizontal joins which form concertina bellows shapes.
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