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T-- sun tunnels designed to direct natural light into areas of the house such as corridors, stairwells, bathrooms etc, where installation of a VELUX roof window is not possible or appropriate. Roof pitches from 15-60°. System incorporates a flat glass rooflight and integrated flashing, a flexible or rigid tunnel and a two-layer frosted ceiling diffuser. Rigid option is recommended for lengths between 0.9m and 1.7m (can be extended to a max 6.0m using tunnel extension sections). Flexible option is recommended for lengths between 0.4m and 1.5m. Frame and integrated flashing are made of polyurethane or lacquered aluminium and the sash and ceiling diffuser are made of plastic.
Minor object standardisation.
Changes to reflect updates to the NBS BIM Object Standard v1.3
Objects have also been updated to Revit 2015
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