100mm hole for extractor fan - timber frame house

[LappyGB]

Hello,

I had hoped this would be a simple job of drilling a 117mm hole from the outside in the void above the ground floor but the fact the house is timber frame is giving me some concerns before I just go for it.

A fan is already installed in the utility and it seems they just cut a massive notch straight into this joist/beam to fit the pipe through through (apologies for the bad quality). Where they have cut is the timber framing before it hits masonry.

I'm looking to do the same thing on another side of the house, I'm guessing there's no issues cutting through this specific beam/joist and it's not structural?

 

[StephenStephen]

Sorry I can't see what's what in the photo.

I certainly wouldn't assume that because someone's cut a massive notch in a beam that it's ok to do so!

 

[LappyGB]

That's a 100mm pipe for an extractor fan running to the outside in the void between the ground and first floor, you can see where some outside light is coming through to the left of the pipe (another job at some point!).

A notch about 2/3 the width of that beam has been cut to fit the pipe through (rather than a circular hole).