Supply air passive ventilation, through wall or ceiling

[Dr Benz]

Planning to install the supply air and have the option to get it through the roof. The advantage is that a heat recovery ventilation system (FTX) can be connected later on. The question is whether to connect separate ducts or connect them in series. Primarily for the bedrooms. I don't want to risk cross-talk, but I don't know if/how this can be prevented.

The alternative is to make holes in the plasterboard and install new inner sleeves in the walls. (The vents have been on the outside before) inside, we have plastered over for now.

Pros and cons?

 

[ricebridge]

The sound from a bedroom that can be heard in other rooms doesn't exactly sound ideal. Some bedroom sounds are more private than others, so to speak.

 

[Håbbe01]

Fairly incomprehensible post but if you're aiming for ftx in the future, focus on central ductwork of fl and tf right now. That is, supply air in the wall from the northern wall and exhaust air on the roof. Supply air devices in bedrooms and living room, exhaust air in kitchen, laundry, bath, wc

 

[Dr Benz]

That thing about sounds from a bedroom being heard in other rooms doesn't sound like a great idea. Some bedroom sounds are more private than others. If you know what I mean.

Haha, I didn't even think that far. Was mostly thinking about if one child is asleep and the other is awake. But you don't want to scar them for life...

 

[Dr Benz]

Fairly incomprehensible post but if you are aiming for ftx in the future, you should invest in central piping of fl and tf already now. That is, supply air in the wall from the northern wall and exhaust on the roof. Supply air vents in bedrooms and living room, exhaust in kitchen, laundry, bath, wc

I didn't think so, but okay...

The idea is indeed an ftx eventually as there is good space in the attic.

However, the main question is about cross-talk between rooms if you have a common duct to several rooms. And also how the supply air works when there are longer distances. Can it create resistance, or will there be a natural flow when the exhaust air functions as it should with fans.

 

[Håbbe01]

Saw that natural ventilation was mentioned in your post now, but it is a term for ventilation where the "fan motor" on the exhaust side was constituted by a heated chimney via wood burning for heating and cooking, and the exhaust air had its own channels in the same chimney. So difficult to replace without installing an exhaust fan on the exhaust air and holes in the wall for supply air. If you install a duct system, you must at least have an exhaust fan.

 

[ricebridge]

Haha I didn't even think that far. I was mostly considering if one child is asleep and the other is awake. But you don't want to cause lifelong trauma…

When both children are awake and both parents, ehrm, are awake with each other, it could indeed result in some lifelong trauma. For the parents. The morning after.

 

[Isakare]

If you want to bring in air from the ceiling, you need a fan.
We previously had 3 bedrooms connected one after another on the same duct, heard nothing, there were sound-dampening vents in the ceiling, placed so they weren't directly above where the beds were.

 

[mojjen]

Installed silencers on each channel a few meters before the valve. Also sound-absorbing flex pipes between the spiro and the exhaust valve. Essentially to dampen the fan motor's noise and air noise, which is probably more likely to become more disturbing than cross-talk. (Except for the bedroom golf, though)