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Electrical

Cutting hole for Extractor fan

Anonymous user 09/03/2024 - 2.38 PM

Hi I need some advice on the advice on cutting the hole through to the outside for an extractor fan, I know the size is 110mm and I have a diamond hole saw, pilot and drill. The only problem is that I'm not sure ill be able to access the wall from the outside, and the wall is thicker than the length of the hole saw so it will not go all the way through. If I drill as far as I can, will or how will I be able to get the extra few inches through from the inside. thanks for any advice given in advance

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2 Answers

GDM Electrics

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Middlesbrough

Drill a pilot hole, from the inside, through both inner and outer walls with a standard SDS masonry bit. Then drill in from the outside with the core drill, with the core drill bit centred on the original pilot hole. Drilling in from the outside allows you to patch up the inside wall with plaster. Patching up external bricks is too messy, especially if you want the outside walls to look tidy. Drilling both the inner and outer towards the cavity, you'd have to be careful to prevent large pieces of debris falling into the cavity which could then give future problems with penetrating damp.

Answered9 November 2016

Internal Repairs

Rating: 5 out of 5

Epsom

You can get extensions for the hole saw :)

Answered26 March 2016