Which 4" Humidistat Bathroom Ceiling Exhaust fan?

160 Euro! Too Pricey.

Xpelair was suggested by a handyman. But lots of bad reviews at Amazon.co.uk etc.

Any sub 100 Humidity Sensor / Humidistat extractor suggestion to be used in a large bathroom?
 
We have expelair unit similar to listed in downstairs toilet on outside wall, no issues in 6 years, it does seem to run a lot for a bathroom with no shower or bath. Do you have room above the bathroom to install a bigger inline unit? In the upstairs bathroom with have a more heavy duty inline unit.
 
No, the bathrooms are in first floor. Only attic above it.

Will the Xpelair" model above enough for a large bathroom?
 
I personally wouldn’t have thought so, on our first floor bathroom, we have an inline unit in the attic above it venting into the roof soffit, much better job although more expensive. They extract at 3-4 times the rate of the type above

eg

Vent-Axia 17104020 100mm Inline Extractor Fan with Timer 240V - Screwfix

Order online at Screwfix.ie. ABS. Circular grille. FREE next day delivery available, free collection in 1 minute.
www.screwfix.ie
 
Instead of a plain extractor fan I recently switched to a Heat Recovery Fan (HRV)
It's not that much more expensive, 137GBP but it saves you on reheating all that cold fresh air coming into the house.

I've been running it for the last 3 months and am very impressed with it. You can leave it running for hours and yet the room is still warm when you come back. I've done that accidentally a number of times now.

Honestly I think everyone should be switching to HRV's instead of extractors.
 
AJAM said:
It's not that much more expensive, 137GBP but it saves you on reheating all that cold fresh air coming into the house.
Click to expand...
How does that one return the heat? The fan in the images looks like it covers the full diameter of the pipe and so will just push air in a single direction. Perhaps there's a return flow pipe there that's not clear from the pictures? 85% recuperation is also on a par with the larger attic systems, can you sense the returning warmed air from the vent when running?
 
I was also trying to figure this out.

It works by extracting air for 70 seconds and heating a heat retaining mesh. It then reverses to blow air into the room for 70 seconds and recovers the heat from the mesh.

You get the heat recovered.

I wonder how efficient it is at dehumidification.
It could be drawing humid air back in from outside.

Might not be very good in our damp climate.
 
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These units extract for a period, say 90s, then reverse direction and supply for a period.
These single room units generally have a ceramic core which stores heat from the air when extracting and then release it to the supply air thus achieving HR.
 

'It could be drawing humid air back in from outside.'
Not if the outdoor air temp is cooler than indoors.
 
While I like these self contained MVHR systems for single rooms, I wonder if they're good for a bathroom, where the overriding purpose is to extract humid air.
IMHO, it is a good idea to consider the whole house requirements, even when installing/replacing a single room vent.

I have a humidity sensitive constant trickle vent in my office, and further ones installed in our en-suites. In my case, I live in a long bungalow and wanted to have air pulled into the extremities from inside the house. If I were to install one of these, then I wouldn't get that air movement.

I have 5 of these in the house

Vent-Axia 409802 Lo-Carbon 100mm (3 3/4") Axial Bathroom App Controlled Extraction Fan White 230V - Screwfix

Order online at Screwfix.ie. Bluetooth controlled extraction fan with variable speed lo-carbon motor. Offering total user control and flexibility with silent mode, purge option and intelligent light sensor with over-run timer. Can be continuous or intermittent with timer and humidity functions...
www.screwfix.ie

And they do a great job in controlling the humidity/air circulation. I think you can now get ones that communicate with each other and have one side of the house sucking and one blowing.

What I've also learnt is that most of the (axial) fans installed in bathrooms that duct through the attic to a soffet vent are grossly under-powered, and are spec'ed for only a 1m pipe run. Putting a centrifugal in-line extractor like the one linked by SETFORLIFE above is a much better idea. I went down that rabbit-hole recently dealing with mould and lack of ventilation in the bungalow.
 
Was about to add that - plus some are not even properly connected and often just vent straight into the attic space
 
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