Is there anything I can do to stop this?

GrubbyGirl_2

This is the vent from the extractor fan in my ensuite.  It's a north facing wall and when it's windy the wind opens up the flaps and cold air comes back into the ensuite which results in the ensuite being a good 5 degrees colder than the bedroom even with the heating on.

Is there anything, a cover maybe, that could stop this happening? I appreciate that when it's working the vents need to open but this is really having an impact on what should be a warm bathroom.

Any advice appreciated

ic

You might want to try alternative covers, but of course that involves access up there.

https://www.amazon.co.uk/External-Cover-Sound-Baffle-Filter/dp/B08KFN1G4T

Otherwise you can install a backdraught shutter in the pipe, which can be fitted from inside - these can reduce the performance of the fan however.

https://www.amazon.co.uk/100mm-Extractor-Draught-Shutter-Spring/dp/B00A50NDEU

Rodders53

Good fans have a flap or flaps to (help) prevent back-draught built into the fan mechanism.  So the outside flap(s) are a second-stage.

You can get inline back-draught (also spelt draft in USA-speak) flaps.  Sometimes called non return valves. One example is https://www.tlc-direct.co.uk/Products/BG4BS.htm

Some ventilation fans can have 'shutters' inside that are actuated either by an operating pull cord or automatically. Random example not a recommendation. https://www.commercialwashroomsltd.co.uk/100mm-axial-wall-mounted-extraction-fan-with-timer-and-shutters.html

I'd suggest the room heating (towel rail only?) is likely inadequate as much as the draught being an issue.  Ventilation keeps mould at bay.  I replaced the towel rail "radiators" with proper radiators in our bathrooms.

bjorn_toby_wilde

I had the same issue and replaced our bathroom fan with an Icon Airflow.  It has a mechanism like a camera iris which opens when the fan is switched on and closes again when it turns off and that completely stops the backdraft. It’s solved the problem in our bathroom.

They can be fitted with timer modules as well so they run on for a while after you’re finished using the room.

Toolstation item 82035. Not the cheapest fan in the world but worth every penny IMO

GrubbyGirl_2

Thank you all for your tips.  I think a change of fan might be on the cards rather than mess with the outside as it's a long way up!

tetrarch

The AIrflow Icon Extractor fans have an active spring-powered closure mechanism that sorts out this problem at source, i.e. in the bathroom. I have had several of these and installed them in my kids houses as well

They come with humidistat modules that work (not brilliantly, but they do work) and come with overrun settings etc

https://www.amazon.co.uk/Airflow-iCON-ECO-15-Extractor/dp/B005FPD49E?th=1

Regards

Tet

Mutton_Geoff

How about buying from your local plumbers merchant rather than all the Amazon links? Those Icon fans are excellent but I want my local shop to still be there in 5 years.