t grid under duct

Old 11-14-19, 11:17 PM
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t grid under duct

i using threaded rod 6mm as hanger with c38 as main then hang t grid by butterfly hangers attached with c38 0.6mm thikness to avoid the distance which is more than 1200mm the duct width
i need calculation sheet of load to be safe for this idea ,should i increase the threaded rod dia and size of c stud or it is enough what i mentioned

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