Extractor vent hole too big

[nicholas221078]

Hi all
We were in need of a bathroom extractor fitting,
My friend or not now lol, said he will come round and drill the hole and fit a vent, then I was getting an electrician round to fit the fan and wiring etc.
To cut a long story short he bought a monrose internal fit wall kit, he drilled a 127mm hole as that's the only bit he had , he says the flange / seal will cover on the outside once he screws it in place inside the loft ( hole going out the gable end).
From inside all looks well but from outside the seal has gone inside the hole, so it's not sat on the bricks outside.
Is there a remedy to smaller then cored hoke down to 117mm, is there a sleeve or something that could be bought, he did apologise and says he will sort it but had to shoot off, im not too trusting now, it's gonna be a job to get the end part pushed back out now , ( read the instructions).
Any ideas? Access from outside is very tricky due to a severely sloped driveway.

 

[nicholas221078]

 

[johnny2007]

They sell all sorts of adapters for this.

 

[phatboy]

Great opportunity to have a 5" extractor, should move more air, or the same amount more quietly.

Or:

https://www.amazon.co.uk/DUCTING-REDUCER-INCH-STRAIGHT-VENTILATION/dp/B004X4S7QI/ref=sr_1_1_sspa?adgrpid=55748339160&gclid=EAIaIQobChMIz8Tl6six-AIVShoGAB0lGgq3EAAYAyAAEgIOOvD_BwE&hvadid=259071597067&hvdev=c&hvlocint=2826&hvlocphy=9075580&hvnetw=g&hvqmt=e&hvrand=7028605502688931975&hvtargid=kwd-313957901965&hydadcr=29355_1792272&keywords=125mm+to+100mm+reducer&qid=1655368669&sr=8-1-spons&psc=1&smid=AK2QYNV7K1QUD&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFZWUVEVlhETFBVTDgmZW5jcnlwdGVkSWQ9QTAyMjExMzAxNkRQUFBSMjdROVBOJmVuY3J5cHRlZEFkSWQ9QTEwMzUyMTIxN1VSRDRKNkJFRUowJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

With:

https://www.amazon.co.uk/Grill-Gravity-Ducting-External-Ventilation/dp/B00BSZFDHQ/ref=sr_1_6?keywords=125mm+vent+cover&qid=1655368721&sprefix=125mm+vent%2Caps%2C73&sr=8-6

 

[Jake2021]

What a mess! You rather get the right core but or don't do it, as above get adaptor or vent just a are on I'd get a valve for your soil pipe as you may get smells through the extractor , wouldn't of been a issue before you vent as there's no window

 

[nicholas221078]

Thanks all.
It's just the access from outside is a no go without more expense, I just can't afford that expense at the minute.

 

[Jake2021]

Until you can afford it stick.one.of these on for £3 it willstopbirdsand bees going in it, it's flat on the back

 

[phatboy]

Can you lift a 5" vent up from the ground outside, on a string? Then position it from inside. If you get a round vent, you should be able to make it look fine. Pre-silicone the 4" - 5" adapter, so the vent stays put.

 

[Jake2021]

There’s no window in the pic, ignore that I’m assuming you mean through the vent phatboy… only issue with that is you
Can’t see if it’s level

 

[phatboy]

There’s no window in the pic, ignore that I’m assuming you mean through the vent phatboy… only issue with that is you
Can’t see if it’s level

Yes through the vent hole.

Well from inside you should be able to see if the horizontal lines are correct, or take a peek outside quickly. If it cannot be seen from outside either.... probably wont matter!

Silicone takes 1hr or more to go off, so you would get a bit of adjustment time.

 

[nicholas221078]

Thanks its all food for thought and good ideas, there is a window in the bathroom but the missus won't open it (scared of creepy crawlies) the windows right in the bath/shower area so at angles you would be seen naked lol.