Inline 100mm Extractor Vent Hole Size

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3 Jan 2018
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Looking to core drill out in my attic to fit an air vent to use with an inline extractor for the bathroom using 100mm plastic ducting.

I have a 127mm core drill bit to use with soil pipe. Is this way too big for the extractor and I need to buy a smaller size or is it ok to just fill with expanding foam?

Thanks
 
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