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BS EN 1873-1. Prefabricated accessories for roofing. Individual plastic rooflights. Part 1. Product specification and test methods|Prefabricated parts, Performance, Test specimens, Plastics, Durability, Type testing, Watertightness tests, Natural ventilation, Natural lighting, Pitched roofs, Marking, Roofs, Transmittance, Production planning, Conformity, Rooflights

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