Evening. I have a layout suggested to me by BPC, there's a couple of points I'm curious to have other opinions on please. 

 

Do you think 1 valve / 2 ducts is enough extract from the open plan area? 

 

Putting all 3 valves along the centre of the open plan room makes installation easier, but is there a possibility of air not circulating well around the whole room? 

 

Is 2 ducts extracting from the wc overkill? (I'm not sure yet if wc will even have a door on it, but even if it does, 2 seems overkill for such small space.) 

 

For context, ceiling height of the hall+utility is 2.8m. The open plan room is vaulted with a flat top section to create a service void, height 4m.

I'll be having a recirculating kitchen extractor fan. 

 

 

1 vs 2 ducts is more about flow restriction/noise/ duct length than room size.

Thank you dpmiller. The wc certainly qualifies based on duct length. 

 

Any other thoughts on the open plan area ventilation?

Maybe it's fine and I should try to stop overthinking it.