DIY Doctor UK DIY Forums

Hello chaps!

I'm looking to redo the air ventilation in the bathrooms, as we've are adding the 3rd shower room on the top floor (loft conversion).
So the house setup would consist of:
G-floor - clock room / loo (small 6 4" by 22 foot) - 16 feet from loft extractor
1-st floor (main) bathroom (6 4" x 6 4") 10 feet away form loft extractor
2nd floor new shower room (4 foot x 6 4") will be just ceiling high away form loft extractor.

The inline extractor I'm planning to use is: Manrose MF100T (68 litres per second, 245 cubic metres per hour extraction on max) for all 3 bathrooms and balance the airflow using adjustable ceiling vents.
The current air vents are solid galvanised steel 4" pipes which run from the ground floor loo and into the roof.

Is that sufficient for extracting in those 3 locations.
What else do I need to do while I have access? Condensation trap and insulate the air vent pipes?

Any advise much appreciated.
Lumen

We used to use Manrose quite often, but wouldn't recommend them. Have a look at this one.
[url] https://www.cef.co.uk/catalogue/product ... lsrc=aw.ds
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The main problem with extracting air, is that air needs to be replaced, does not matter if for bathroom or cooker hood or tumble drier, air out means air in some where.

The main problem is open flues, and these don't have to be really open, open flue means it draws combustion air from the room, so if you suck air out of the house it can cause combustion products to be sucked into the house.

Old house the tumble drier went out of a hole bored in the wall, it would normally take 60 minutes to dry cloths, this house hole not bored yet, normally takes 45 minutes with same drier pipe out of window, as it is drawing in drier air from outside than it would have been drawing in old house from inside.

Same applies to a shower, have to consider where the replacement air comes from.

Oh wow, that fan is very competitively priced. Thank you, might go for the same model with the timer.

In terms of doing the bathroom ventilation properly, do you think it will be sufficient enough for 3 small bathrooms?

Do I need to consider anything else (apart form condensation trap and lagging current ventilation pipes)?

ericmark wrote:The main problem with extracting air, is that air needs to be replaced, does not matter if for bathroom or cooker hood or tumble drier, air out means air in some where.

The main problem is open flues, and these don't have to be really open, open flue means it draws combustion air from the room, so if you suck air out of the house it can cause combustion products to be sucked into the house.

Old house the tumble drier went out of a hole bored in the wall, it would normally take 60 minutes to dry cloths, this house hole not bored yet, normally takes 45 minutes with same drier pipe out of window, as it is drawing in drier air from outside than it would have been drawing in old house from inside.

Same applies to a shower, have to consider where the replacement air comes from.

What would you recommend? Air inlet fans with filters?

I like the idea of heat recovery units, however it depends so much on bathroom design, three houses mothers, our old one, and our new one.

Our old house has problem, but not mothers and new one, so wondered why. Realised our old house shower over the bath so moisture circulated through whole room, mothers was wet room no curtain so no or little circulation, and new house shower has door sealing at the bottom so again no circulation.

Also new house humidity around 45% to 50% where old house around 60% to 70% so since house is drier it does not need an extractor fan.

Main point is how well house is ventilated not just the shower, so if there is a heat recovery unit which does not need to be in bathroom, house will be drier, so may not need bathroom fans.