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Voids on escape routes

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Can anyone please explain where the 4.5m distance for means of escape past a void originates (with a reference if possible).

 

Thanks

What guidance are you quoting and most fire safety guidance originates from the post war studies with a bit of tweaking through the years.  

The guidance is contained in Approved Document B and BS9999; Diagram 14 and Figure 4 respectively.

I do not believe you will get an answer to this one, as I said most fire safety guidance originates from the post war studies with a bit of tweaking through the years. You will never know who tweaked it and for what reasons.  I think you will find many similar situations in fire safety and I think you will find a rational scientific reason for any of them.

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