MVHR complete beginner help please!

[AppleQueen]

Hello MVHR friends! I have been lurking on this forum for months whilst planning my MVHR and I could do with some help please!

I have attached some plans that I have received from BPC which I don’t think are quite suitable because the upstairs has vaulted ceilings with exposed beams and there is no way for me to create enough space in the ceiling for the pipes, same with the kitchen, there is no space on the vaulted ceiling for pipes. There is also no access across the hallway void to bridge the two sides of the hallway upstairs. Bathroom 2 is no longer a bathroom so no vent needed there and bathroom 1 is no longer an en-suite it is a family bathroom with door to hallway.

I have attached the plans from BPC and then marked my own crosses (red extract, green inflow) and purple for the possible placement of the unit.

If anyone could help with any of these points it would be really appreciated:

1. Could you help with the placement of the vents if you can see anywhere better for them? I am struggling especially with bedroom 1, bedroom 3 and the kitchen because they can’t be in the ceiling. 

2. Would it be better to have two separate smaller units, one to supply the left side and one right? Or one to supply the ground floor and left side of upstairs and another for right side of upstairs?

if you have any other suggestions or words of guidance I would really appreciate it!

thanks!

MVHR1.pdf MVHR2.pdf

[MikeSharp01]

Looks like it should work but can you get the pipes where you need them. You want to try and get the supply vents across the room from the door if you can so you don't get any stale air pockets so if possible I would move them across a bit to be on the diagonal to the doors upstairs. Not sure why you have two supplies in the dinning room and might be worth checking the kitchen extract location in relation to the hob and defo put a sock in it to trap particulates. Did the designer give you the flow rates etc?

[AppleQueen]

Thank you for your response! If they can’t be on the diagonal to the door, is it a huge problem or just a ‘do the best that you can’ sort of thing? I think due to the design, it’s never going to be optimal placement here but would it still be better than not doing it at all? I sort of need to have the system now because my windows don’t have trickle vents in.

The dining room is large - 36m2 so could that be why it needs two? 
No flow rates, this is the first design they have done for me and now the guy has gone on holiday which is why I’m posting here!

Do you mean an actual sock??

Thank you!!

[MikeSharp01]

No not a problem just do the best possible, 2 supplies will make the flow rates lower so quieter. You need to do the math to work out the flow rates so you can get the right size pipes to keep the noise down tvhe bigger the better and double them up even better.