Venting two bathrooms

[CptFfolkes]

I have an en suite which currently has a through wall extractor which does a poor job of extracting steam from the shower. The main bathroom has no extractor as it appears the previous owners removed it and tiled over the hole. Both bathrooms have their own isolator switch above the door.

 

It looks like two (maybe one with joined ducting?) inline fans would be the best, not sure what venting option is best, the gable wall is right next to the bathrooms.

 

Do I take this as a good time to improve ventilation throughout the house, a more complete system pushing fresh air into the upstairs hallway? The house doesn't suffer from mould or condensation, trickle vents on a few windows throughout so thinking more about air quality.

Edited January 17 by CptFfolkes

[saveasteading]

The issue with a joined duct and shared inline fan is that turning on one light will operate both extractors, perhaps wasting lots of heat.

 

As to ventilaion, the air is being replaced, probably under the door, and so is coming from somewhere else, unless the house is sealed.

But first check that the fan is working. Does it suck a spread tissue and hold it? It should do that easily. Next try a  dry j cloth.

[CptFfolkes]

The extractor in the en suite does work it's just not that good and it's in the opposite end of the room to the shower. It's rated for 68m3/hr whereas theres plenty of inline fans which claim several times that number.

 

Installing one per room isn't a problem, maybe units which have a trickle and boost would be ideal.

[JohnMo]

Certainly for your upstairs I would look to install dMEV fans (one in ensuite and one in bathroom), these run at a low rate all the time and boost when needed. As long as you have an under cut below the door of about 10mm (or other means to allow air to move) will take the air from trickle vents in bedrooms. This provides cross ventilation to improve the air quality. 

 

Greenwood CV2GIP, fans are really good. Silent, easy to adjust, have built-in humidity sensors and can be picked up on eBay very cheaply.

 

Add to this humidity sensing trickle vents, these open and close as required to maintain air quality. If you have a trickle vent in your bathroom or ensuite seal these closed when you get everything else sorted - this trickle vent makes a short cut for the air and your bedroom doesn't get ventilated.

[JohnMo]

9 hours ago, CptFfolkes said:

more complete system pushing fresh air into the upstairs hallway?

No you don't need complex