How do I form a seal between these please

[Madrab]

If the run is overly long and situated in a cold space then there is always going to be an issue with condensate.

Even if insulated, if the run is overly long, then the air will always reach dew point before it gets outside and condense. The only real solution is to shorten the run, create a sump with a drain tap or introduce other ventilation in the room itself.

 

[Jupiter01]

create a sump with a drain tap

How do I do that with my current manrose pipes or the soil pipe arrangement? Will I then periodically drain it here? I think this is the sort of thing I had in mind but would appreciate some more details.

 

[HERTS P&D]

Vent through the sofit.

Andy

 

[Madrab]

If you are using soil pipe then when it goes to the vertical you could fit a branch and use an screwed access cap on the bottom leg in a piece of pipe, that will create a collection point that can be emptied, or have a pipe screwed in to drain it externally, just have the pipework run dropping to that point.

 

[Jupiter01]

If you are using soil pipe then when it goes to the vertical you could fit a branch and use an screwed access cap on the bottom leg in a piece of pipe, that will create a collection point that can be emptied, or have a pipe screwed in to drain it externally, just have the pipework run dropping to that point.

In my set up, I have around 1 metre flexy pipe that goes from the bath grill to the fan. I then have a 1.5 metre horizontal manrose pipe which eventually connects to the vertical pipe out of the roof.
I am tempted to raise the fan so that the rigid horizontal pipe (soil pipe) is sloping down slightly before it reaches the vertical section, heading out of the roof. In this corner I can have one of these

to drain down every now and again.

 

[denso13]

Just slope it gently towards the fan, any moisture which condenses will then come out of the fan grill. It shouldn't even be noticeable as it won't build up.

Other than that it really needs a permanent drain off, not the bend above.

 

[Jupiter01]

I was thinking something like this?

 

[denso13]

That will fill with water then spill out when you take the inspection cap off. Just slope it to the grill.

 

[Jupiter01]

That will fill with water then spill out when you take the inspection cap off. Just slope it to the grill.

I was thinking that I could put one of those folding water buckets under the inspection cap and clear out periodically.
If I slope it slightly towards the fan, will the fan allow the water to pass back through the other end or will it just get overwhelmed? I am looking for a robust solution as I am having to revisit this every few years.

 

[denso13]

If I slope it slightly towards the fan, will the fan allow the water to pass back through the other end

Yes, the fan casing should be a similar size to the ducting.

 

[Jupiter01]

Yes, the fan casing should be a similar size to the ducting.

Presumably this method will work with my current manrose pipes? I just need to slope it towards the fan, as you suggest i.e. no need to replace with soil pipe.
Yes, the duct and fan casing is the same size but will the fan propellor allow water to pass back through it, down the flexible duct and back through the grill? I wasn't sure if the design of the fan disallows water to pass back.

 

[denso13]

Presumably this method will work with my current manrose pipes?

Yes, there are many thousands of inline fans fitted, I've yet to see one with soil pipe.

 

[Jupiter01]

Yes, there are many thousands of inline fans fitted, I've yet to see one with soil pipe.

sorry just one more @denso13. The manrose pipe fits over the fan casing (with some duct tape) and by sloping the pipe towards the fan is there a likelihood, that it will leak at this join?

 

[Madrab]

If you use your bend you could drill a hole into the cap and then run a fitting into it, then run a pipe from that externally.

Helped create sumps like that on extended extractor runs before using 110mm SP, seen it used many times. They were connected to 110mm soil pipe to run the length of the loft and then a vertical section onto a flexi up and into a roof outlet terminal. Once used a 12mm barbed fitting drilled and screwed/glued that into the inspection cap and ran a 12mm plastic pipe out the soffit, any water caught in the sump just ran out and dripped down into the garden.

That used a branch though short piece of pipe, SW coupler and then a SW cap, that created the sump.