Extractor duct at an angle

[Jupiter01]

I am kicking myself as I’ve made the same mistake as I did a few months ago!
I’ve drilled out the extractor hole and fitted a vent on the outside. Now that I’ve tiled the bathroom, I’ve noticed that the duct is not level and hence the extractor is raised by an inch at the top.

I could use a flexible duct but that will need me to clim on a ladder outside to fix it to the vent.

can I instead, use half rigid pipe and half flexible? This will mean that I can push the rigid pipe against the vent from the inside and then use the flexible duct to connect to the extractor unit.

Thanks in advance.

 

[SFK]

Yes.
Actually that is how my Tumble drier is set up. A rigid pipe through the wall (no-more-nails holding it in place) and the Tumble Dryer connected to this with a flexible pipe.
I use this to connect the flexible to the rigid.:
https://www.screwfix.com/p/manrose-round-pipe-connector-white-100mm/12697
SFK

 

[Jupiter01]

That's awesome! Thanks @SFK
Can I then use this on the other end of this fitting and then on to my extractor?
https://www.screwfix.com/p/manrose-pvc-flexible-ducting-hose-white-3m-x-100mm/18232

 

[SFK]

Yes. That is the correct flex pipe.
Note that there is also a kit here (that I have not used) that shows that this is normal practice: https://www.screwfix.com/p/manrose-tumble-dryer-termination-kit-100mm/11703?_requestid=653921
I attach the flex pipe to the coupler with a zip cable and couple of self taping screws. Then I normally simply push the connector into the straight pipe as a non-permanent join so I can clean later if needed. A bit of glue if you wish to make it permanent.

But you have a potential problem depending on direction of tiit.

I always tilt the pipe in the outside wall downward towards the outside.

The outside wall tends to be cold. The water vapour being moved by the fan can condense on the cold walls of the pipe in the wall, forming water droplets.

If the wall pipe is tilting down towards the outside the drips of condensed water flow outside with no issues (it will only be a few drops on outside wall).

But if the wall pipe is tilting down towards the inside, the drips water from the condensation can collect in a U section of the pipe and then leak onto the ceiling. This is not always an issue (if only a bit condenses) but can leave a stain or damage on ceiling if there is a lot of condensed water (ie cold day with lots of steamy showers).

SFK

 

[SFK]

Forgot to add that I sometimes use this plate to hide the mess I make on inside wall: https://www.screwfix.com/p/manrose-round-pipe-wall-plate-white-100mm/13448

 

[Jupiter01]

My pipe slopes down in an inward direction. I assume the u section will be inside the cavity and any drips will be here? I assume that's not too unusual for the cavity?

 

[SFK]

If you are using straight pipe in the wall, by which I mean this:
https://www.screwfix.com/p/manrose-100mm-round-ducting-1m/544gy
any water will flow back to the joint between the straight pipe and the flexible pipe. For me this is normally at the inside wall (as I put the straight pipe all the way though the wall so that it is flat on the inside wall and on the outside wall).

Note that what I have suggested might be a problem, is only a small risk as the air is normally moving fast and this condensatation issue happens more often where the pipe goes through a cold roof. So I would not get worried about it, but I wanted to warn you of the risk as it is a possibility.

SFK

 

[Jupiter01]

update: this worked a treat @SFK. My extractor is now flush against the tiles.

Just noticed I don’t have the finished pic. Here’s work in progress.

Thanks for your help