MVHR exhaust distances and wall placement HELP

[Alexmash]

Hi all, 

 

We are currently fitting a Mitsubishi MVHR Lossonay 350L to our self-build. 

 

The unit has to sit 300mm off the floor to allow access, and the exhaust has to be 1500mm clear of the inlet. With the restrictions on site we can only get to 1300mm between the two. Will this work/be comissioned?

 

Also, pipe runs are proving tricky in some rooms. I know you can have floor or ceiling mounted vents in rooms but is a wall mounted one possible? 

 

Any advice gratefully received. 

 

Thanks, 

 

Alex 

[Russell griffiths]

Wall mounted, see them all the time, you can switch to rectangular duct, or the oval one. 
everything is possible. 

[JohnMo]

Just use a combined inlet outlet, they work well (I have two)

https://www.paulheatrecovery.co.uk/product/160mm-directional-external-combi-grille-for-mvhr-black/

 

Edited yesterday at 17:07 by JohnMo

[Nickfromwales]

1 hour ago, Alexmash said:

Hi all, 

 

We are currently fitting a Mitsubishi MVHR Lossonay 350L to our self-build. 

 

The unit has to sit 300mm off the floor to allow access, and the exhaust has to be 1500mm clear of the inlet. With the restrictions on site we can only get to 1300mm between the two. Will this work/be comissioned?

 

Also, pipe runs are proving tricky in some rooms. I know you can have floor or ceiling mounted vents in rooms but is a wall mounted one possible? 

 

Any advice gratefully received. 

 

Thanks, 

 

Alex 

1300mm is plenty, you’d be ok at 1000mm tbh; if you're happy to receive ‘real world’ advice

 

In-wall is fine, done this plenty of times, just a bit less ‘aesthetically pleasing’ to some.

 

How so tricky? Have you not got posi joists?

[Jolo]

1 hour ago, Alexmash said:

Also, pipe runs are proving tricky in some rooms. I know you can have floor or ceiling mounted vents in rooms but is a wall mounted one possible? 

 

I went for wall vents in a couple of rooms, and have since increased the number too!

 

In the bedroom (supply) we have one of these: https://www.ventilationland.co.uk/en_GB/p/uniflexplus-wall-manifold-rear-connection-1x-o90-mm/9744/ with an adjustable grille insert: https://www.ventilationland.co.uk/en_GB/p/uniflexplus-grille-with-adjustable-louvres-200x100-for-wall-manifold/9770/ (it's a slight faff to install if the wall is thick, but still doable).

 

I'm considering converting the kitchen to one too, which would mean I wouldn't need to add a dropped ceiling in there.

 

I was also originally planning to add a dropped ceiling in the toilet too, as I had the pipe coming through at the top of the wall, then a 90-degree adaptor. But then I realised it would be much easier to just end the vent with a flange at the hole in the wall, and put a circular vent cover on that (as it's extract, the directionality isn't really important).

[Alexmash]

3 hours ago, Nickfromwales said:

1300mm is plenty, you’d be ok at 1000mm tbh; if you're happy to receive ‘real world’ advice

 

In-wall is fine, done this plenty of times, just a bit less ‘aesthetically pleasing’ to some.

 

How so tricky? Have you not got posi joists?

More than happy with real world advice especailly when it's the answer I so desperately want to hear! You don't think sign off will be an issue?? And no, sadly no posi joists...

[JohnMo]

Combi grille I linked to, are fully compliant with BRegs.

[Nickfromwales]

15 hours ago, Alexmash said:

More than happy with real world advice especailly when it's the answer I so desperately want to hear! You don't think sign off will be an issue??

My PH certified designer is Ok with 1000mm separation, so ergo, I am also good with that; or anything more as a bonus. 
 

15 hours ago, Alexmash said:

And no, sadly no posi joists...

I feel your pain. 
 

Currently on site retrofitting a whole of house MVHR system into a converted 3 storey, brick built Victorian semi…..

 

Done more carpentry and joinery than MVHR work here tbh!! 🥵