Ventilation circulation

[calumm]

I'm looking to get new dMEV extractor fans (i.e. with continuous trickle ventilation) in our kitchen and two bathrooms, and to get trickle vents installed in the existing windows in the other rooms (most do not already have them).

 

Off the hall, we have 2 bedrooms and a bathroom at one end; and 2 bedrooms (including ensuite), a sitting room and a kitchen at the other end.
We have an ensuite bathroom off one of the bedrooms.
We have a family room (an extension, leading to the garden) off the kitchen. The kitchen is effectively internal, with no windows. The kitchen and family room are connected via a 1.3 m wide entrance to the family room, and also the space where the old kitchen window was; so they are more-or-less open plan.
The house is around 1930, so it is probably quite leaky air-wise.

 

I have a few questions, mainly about the resultant air circulation in the house.

 

Q1
If we put a trickle vent in the ensuite bedroom, will most/all of the air going out of the ensuite bathroom fan be replaced by air from the trickle vent in the ensuite bedroom? And therefore won't generate much circulation from the rest of the house?
Similarly, our family room already has 6 trickle vents. So most/will all of the air going out of the kitchen fan be replaced by air from the trickle vents in the family room, not generating much circulation from the rest of the house?
This might leave the other bathroom fan to provide the suction for the three other bedrooms and the sitting room. Also, as two bedrooms doors are beside the bathroom door, and the other bedroom and sitting room are at the other end of the hall, might the latter (other bedroom and sitting room) struggle to get circulation?

 

Q2
Our sitting room has a bay window with three windows. Should we get a single trickle vent, or trickle vents in all three?
Similarly, the ensuite bedroom has a main window and a further smaller window - should we get trickle vents in both?

 

Q3
Should we get trickle vents in the bathrooms (i.e. where we are installing the fans)?

 

Q4

Our door are generally quite old and ill-fitting (e.g. they don't full close, or are slightly askew). There is typically 0.5 to 1 cm gap at the bottom. Should this be sufficient?

 

Thanks - Calum

[JohnMo]

I would install trickle vents that open and close automatically based on humidity. If the area is ventilated enough the trickle vents should close. They are pretty cheap, require no power.  Example https://www.bpdstore.co.uk/glidevale-energy-saver-humidity-sensitive-trickle-ventilator/p/182

 

Q1, set the flow of the fans for the room the are in, the self opening/closing trickle vents will look after the rest.

 

Q2 yes

 

Q3 no

 

Q4 yes