MVHR Grill placement for supply / extract

[Wookie_73]

Hi all.

 

I am in the midst of designing my MVHR system for my house I am renovating.

I am happy with he design on the whole but I have one room that I am not sure about the vent placement, indeed even if I should have supply vent in that room at all.

I have attached my proposed layout / vent placements for the first and ground floor. Any comments are more than welcome.

I have also attached a ground floor layout marked up with a 3.5m distance between a supply and extract vent.

My question is this a great enough distance to prevent short circuiting?

Also do I even really need this vent? I added it to help bring down the air velocity in the main air supply vent on the ground floor.

I realise the ducting takes a convoluted route on the ground floor. This is because I am dropping the ceiling level every where on the ground floor by around 100mm to accommodate services except in the hallway.

All vents located near corners are 350mm away from walls.

 

Also would you normally put the vent in the bathroom above the bath / shower area?

 

Thanks for any advice.

Dave

 

MVHR Layout Ground.pdf MVHR Layout Ground - With notes.pdf MVHR Layout First.pdf

[Nickfromwales]

Hi. 
Firstly, you’ve left the address on public view, do you want to upload anonymised versions instead? 
 

Secondly, are you making the property airtight and are testing it with an aim to get a target result? Eg <1 ACH. 

[JohnMo]

16 minutes ago, Wookie_73 said:

would you normally put the vent in the bathroom above the bath / shower area

Mine are directly over baths or shower areas. But other will say the complete opposite, so make your choice.

 

Difficult to tell from the drawing is it one large kitchen diner? You seem to have 2x extract one over island and other over sink? If one room one extract is fine, but not above hob, as you will fill the system with grease.

[Mike]

8 hours ago, Wookie_73 said:

All vents located near corners are 350mm away from walls.

I wouldn't put the ceiling supply vents right in the room corners & so close to the walls, particularly in the bedrooms. Many such vents use the Coanda effect (which is recommended) so that the air disperses evenly across the ceiling. However, if a wall is in the way, the air will be deflected down the wall and may cause an unwanted draft; from memory 750mm is the recommended minimum distance from a wall. Zehnder's Luna S (and probably others) have an optional deflector that can be inserted to get around that.

 

8 hours ago, Wookie_73 said:

I have also attached a ground floor layout marked up with a 3.5m distance between a supply and extract vent.

My question is this a great enough distance to prevent short circuiting?

Also do I even really need this vent? I added it to help bring down the air velocity in the main air supply vent on the ground floor.

What @JohnMo says. Just add a double pipe to the extract over the sink.

 

7 hours ago, Wookie_73 said:

Also would you normally put the vent in the bathroom above the bath / shower area?

Zehnder's advice is to place the extract near a shower, but not within / over it.