Extract fan recomendation

[littlespark]

Got a job coming soon that’s going to be a nightmare, but in the meantime there’s a few odd jobs to do. One of them is to replace a timed fan in a bathroom.

The way the apartment is constructed, there’s no window in the bathroom, and the existing 230v fan is located above the bath, through a wall and then ducted 3m to outside through another room.

like for like replacement, but no way I am fitting a 230v in that location... so, I’m looking for a fairly strong 12v fan with timer, with enough oomph to pull the air the full 3m distance.
Another apartment above so ceiling mount isn’t an option.
Placement of transformer is also a problem.

Solutions?
(inline fan in the pipe box? Just thought of that)

This same property has another bathroom on a lower floor, has window, but no extractor and it’s fully tiled. Options for extract fan here?
2ft thick outside walls, and he doesn’t want tiles broken. Tiles are also in a brickwork pattern so I can’t even take out one square tile and core through from there.
First thought is the window is recessed into the wall at an angle, and that part of the wall isn’t tiled. Core through on the angle, same from outside and meet in the middle, at a rather obtuse angle?
Flexiduct through the hole.
Customer is waiting for planning consent as the building is listed for this new hole and the refurb to come.

 

[Mike Johnson]

Remove the pilot drill once you have about 25mm drilled into the wall to act as a guide.

Nor do I?

Six inch holes are fun.

 

[Mikegh]

I'll retype that

Also seen something about drilling pilot holes to reduce dust but didn't quite get that idea ?

 

[brianmoooore]

Joists in an old building probably have herringbone strutting between the joist.

Appropriate length of 3 X 2 and a large hammer will deal with these. Many have met their end this way by myself and my trusty 4lb lump.

 

[Mike Johnson]

That strutting is just there for decoration, and don't forget to drill holes wherever you want in the joist while your at it.

 

[brianmoooore]

Buildings like this tend to be somewhat over engineered by modern standards, and built with nice close grained timber, not the modern stuff with rings a cm apart. Removal of a strut or two isn't going to cause any movement.

 

[Mike Johnson]

Until the next person comes along and thinks exactly the same.

 

[Mike Johnson]

I'll retype that

Also seen something about drilling pilot holes to reduce dust but didn't quite get that idea ?

May be alluding to drilling all around the outside of a large diameter hole instead of diamond drilling, there is no doubt that diamond drilling does cause a lot of dust, but you do get a neat hole that requires very little finishing, even through plaster, and outside just a neat hole to put the cowl in.

 

[littlespark]

My last core was through 800mm of rubble built solid stone walls.

Once you’ve drilled through with just a long 10mm bit or whatever, start off the core using the pilot… will keep it straight following the first hole.
You’ll need a few inches cut with core before you can dispense with the pilot and let the core follow its own path.

There was a section where the rubble would drop into the new hole. I just had to clear it frequently.

Hire a drill and core if you can. Saves burning out your own machine, and keep a tight hold of the drill!

 

[Mike Johnson]

As both I and @littlespark have said keep hold of the drill using the side screw on arm, I have seen broken wrists through the core jamming and the drill not having a clutch, I had my own Marcrist set, about the best dry core bits you can get without spending mega money.

 

[Mikegh]

I'd get the core drill
I suppose the best thing with the ducting is go to the builders merchant .
I usually end up getting parts that don't fit together.

 

[Mike Johnson]

TLC sell the right size ducting for extract fans it's either 4" (100mm) or 6" (150mm) not drainage pipe from a builders merchant, or go over to France and pick up 100mm or 150mm drainage, are we are banned from France at the moment.

 

[Mikegh]

The French have finally got around to banning you

 

[Mike Johnson]

They have banned all non EU persons, not just me, I suppose that does not include you though.