Replacing timber beam with RHS.

Hi all,

Our old cottage has a timber beam measuring 140mm x 65mm and spanning 4700mm from one external wall to the other;

Here is an image;

Attachment 77951

I want to replace this beam with a steel RHS so that it doesn't sit as low across the room. What is the correct size?

I imagine this is listed in a span tables book which someone has paid good money for, so in payment here is a

and



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