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… under an 'A' Class door or shutter. The sill plate, sill channel or coaming, whichever is applicable should be welded … approval. 4.4.5 Bottom profiles 4.4.5.1 The steel angle or channel profiles which support the bottom edges of the panels … and over Minimum Thickness of Coaming 3 mm 5 mm For widths or diameters of ducts exceeding 300 mm but not …
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