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Hi I wish to put in a false ceiling which will have no load on it other than its own weight and 2 layers of plasterboard. The span of the room is 4.0m Having looked at numerours tables, it seems as if i need the joist sizes to be 170x50 . If I supported the joists at the middle...

Hi I wonder if you can help, although there are many previous posts on this matter I cannot seem to find my particular scenario. I want to install a fan with integral timer, the unit has the usual connections , ie neutral, permanent live and switched live. The current ligthing arrangements...