Size of extractor fan

Partly depends on how big your bathroom is but (as a guide) the Building regs (Part F) recommends a minimum of 15 litres per second as the extract fan rate for a bathroom.
 
bathroom is 13 metres cubed, what is extraction rate needed, what is formula for working this out?
 
New2Game said:
bathroom is 13 metres cubed, what is extraction rate needed, what is formula for working this out?

'kin hell, that is enormous, don't reckon a manrose is going to help. But I'll guess that maybe it is 13 cubic metres.
 

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