Bathroom Extraction - Inline out of roof

dlockers · 22 Jan 2024 at 12:39

Hi folks,

As part of my bathroom reno I want to put a proper extraction system in. The front windows are road facing so will hopefully be rarely if ever used. Because I have a hipped roof I am proposing a roof venting system out of my 1930s rosemaries.

What vents would you guys recommend? They seem to range from £30 to $outrageous.

ChrisD. · 22 Jan 2024 at 12:40

The extractor unit itself you mean?

dlockers · 22 Jan 2024 at 12:46

ChrisD. said:
The extractor unit itself you mean?

I've only ever had a wall unit so I've no idea what I am looking for - presumably an inline unit, a ceiling unit, and something for the roof?

Orifice · 22 Jan 2024 at 12:55

The vent depends on your roof tile type, and if you want it to blend in or are not that bothered. For Marley tiles you can buy matched vent tiles https://beddoesproducts.com/collections/marley-tile-vents For inline units I've always used Manrose, something like the MF100. Internal vent is just a grill, but make sure you get a backdraft shutter, and either a condensate trap or use insulated ducting.

ChrisD. · 22 Jan 2024 at 12:58

dlockers said:
I've only ever had a wall unit so I've no idea what I am looking for - presumably an inline unit, a ceiling unit, and something for the roof?

Vent-Axia 17104020 3 3/4" Axial Inline Extractor Fan with Timer 240V - Screwfix

Order online at Screwfix.com. ABS. Circular grille. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

I have a pair of these, hose from the bathroom and en suite ceiling, then hose to vented roof tile.

fastwunz · 22 Jan 2024 at 14:27

You need a vented roof tile and the appropriate fixings will then duct the vent through the roof void

R.O.S.S.I · 22 Jan 2024 at 18:40

I installed both my inline fans in the loftspaces and vented then out of the eaves with ducting.

ChrisD. · 22 Jan 2024 at 19:02

R.O.S.S.I said:
I installed both my inline fans in the loftspaces and vented then out of the eaves with ducting.

Works fine but if the length to the eaves/soffit is long it can be problematic.

BUDFORCE · 22 Jan 2024 at 19:37

Yea manrose mf100t

Basically you have a vent on your ceiling, then pipe, then fan, then pipe then roof vent.

They are much better than wall ones, I'd recommend one on a timer, and leave it running particularly this time of year, because it gets cold in your loft and it can condense in the pipe very easily.

Uhtred · 23 Jan 2024 at 17:36

**thread hi-jack**

I'm looking at fitting an inline fan in the loft space as well, although it will vent to the gable wall.

In terms of the bit between the ceiling and the fan, is it best to use a short run of flex pipe or some angle connectors with rigid pipe?

ChrisD. · 23 Jan 2024 at 18:14

Uhtred said:
**thread hi-jack**

I'm looking at fitting an inline fan in the loft space as well, although it will vent to the gable wall.

In terms of the bit between the ceiling and the fan, is it best to use a short run of flex pipe or some angle connectors with rigid pipe?

Personally I'd say use insulated flex if you can, but it's not a hard requirement. The hard piping can end up with condensation on the outside.

Uhtred · 23 Jan 2024 at 20:12

ChrisD. said:
Personally I'd say use insulated flex if you can, but it's not a hard requirement. The hard piping can end up with condensation on the outside.

I'd quite like to use rigid pipe for the run from the fan to the wall as it's approx 2m and I want the best airflow possible. Insulating it is a good idea, I can even tuck it between the loft insulation layers.

It's the bit between the ceiling and the fan that i'm unsure about, I guess I would need a 90 degree bend, or possibly 2x 45 to get the pipe into the fan

EH75 · 24 Jan 2024 at 14:59

I've got rigid piping but did have issues with condensation so I wrapped it in a few layers of that insulation sheeting you can get (the stuff that is like silver bubble wrap). Been fine ever since.

Chabsy · 24 Jan 2024 at 17:30

I have my shower vented into my loft and the out through my soffit board.

dlockers · 24 Jan 2024 at 17:50

Chabsy said:
I have my shower vented into my loft and the out through my soffit board.

I have a hipped roof so it isn't possible - unless you can vent steam downwards!

Chabsy · 24 Jan 2024 at 21:48

dlockers said:
I have a hipped roof so it isn't possible - unless you can vent steam downwards!

If you have an extractor fan it is. i will post a photo when its light.

dlockers · 24 Jan 2024 at 22:00

Chabsy said:
If you have an extractor fan it is. i will post a photo when its light.

That'll be a game changer if so....I was planning on the plumber for a few jobs because I couldn't do the roof bit. If I can vent down the hip I can probably do the lot myself...!

ChrisD. · 24 Jan 2024 at 22:58

dlockers said:
That'll be a game changer if so....I was planning on the plumber for a few jobs because I couldn't do the roof bit. If I can vent down the hip I can probably do the lot myself...!

Is there a reason you can’t vent to a tile?

dlockers · 24 Jan 2024 at 22:59

ChrisD. said:
Is there a reason you can’t vent to a tile?

I can - I just can't do that job myself / would prefer someone else to take the risk. The hip I can happily do myself and is low risk.

ChrisD. · 25 Jan 2024 at 09:22

dlockers said:
I can - I just can't do that job myself / would prefer someone else to take the risk. The hip I can happily do myself and is low risk.

It's what I got a roofer in for, but for me it's quite a distance to the soffit from the en suite.