Vaulted Ceiling Extract Position

[Jambutty]

Hi, I’m sorting out our MEV system but unsure what to do in our en-suite.
 

it’s a vaulted ceiling with little space, would the position of the extractor in the picture below be OK or am I best figuring out how to get it as high as possible?
 

 

[nod]

I’ve put ours on the wall 

Not ideal adding a cold spot in you VC

 

[MikeSharp01]

I suppose that the higher the better would suit lighter than air gases, which most constituents of farts are - so they do some of the work for you if you see what I mean. JS Harris had a an extract directly into his WC bowl via the cistern IIRC.

[nod]

2 hours ago, MikeSharp01 said:

I suppose that the higher the better would suit lighter than air gases, which most constituents of farts are - so they do some of the work for you if you see what I mean. JS Harris had a an extract directly into his WC bowl via the cistern IIRC.

I’ve had to put ours at 1500 on the wall As designed 

Not ideal But preferable to long runs of ducting 

I thought there would be a minimum height But BC stated High as possible 

[JohnMo]

So a little left field, could installing a dMEV fan in that location simplify things, it could be placed high up and extract though the roof or the block work wall?

[Jambutty]

Thanks for the replies, I did consider a dmev but I really didn’t want roof penetrations and the brick wall backs onto the stairs. 
I do have another bathroom that I will

probably use a dmev fan for as the duct run back to the MeV will be double the rest of the runs. 

[JohnMo]

Where does the duct currently come into the room for your extract?

 

Plan of the room would be helpful? Showing shower, toilet, sink, and duct entry.

[Jambutty]

Ignore the layout on the drawings, on the picture the shower is going where the scaffold board is, toilet is the ladder and sink is the hop up step. 
The red dot is where I’m thinking of putting the extract valve as the void behind is perfect with the MEV unit on the other side of the brick wall behind it. 
I could get some flat 51 duct and go further up the ceiling but I’d be compromising the insulation. I guess if it doesn’t work too well we can just open the massive Velux to clear the moisture! 
Maybe I'm just overthinking the whole thing! 

[MikeSharp01]

A small duct won't compromise your insulation much and allow you to get to the highest point. You have a lot of volume in the room above your proposed valve location so I would go higher. Where we have compromised the insulation we have upped the spec of the insulation in that area. So adding some PU, the main is blown cellulose, in that area to get back to similar spec.

 

 

[Conor]

Drop a small false ceiling down, maybe 300mm deep, 400mm wide, along the length of the room.