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En-suite requires a replacement fan. I'm going to replace with an inline.
Option X:
The existing set-up has horizontal length of flexible for about 30cm then vertical of about 150cm through 90 degrees to vent through external wall.
Option Y:
I can run a full horizontal of insulated ducting from the fan, across loft space and out of vent under eaves of house. About 5m length.
So.....which option.
I will put a condensation trap in too.
Thanks!
If you can locate the fan on an external wall then bore a 100mm hole and vent directly that way. More efficient but probably more expensive?
There is no option of going straight out from the bathroom (en-suite surrounded on all sides by other rooms or double wall into integrated garage.
In the loft space about the ensuite, going vertically by another 1.5m takes out above the garage roof via a 100mm hole and 100mm pipe through the walls. This is how is is currently vented.
However, given this involves a ~ 1.5m vertical section of ducting, I wondered whether running an insulated horizontal duct of about 5m would be a better option. I would then seal off the existing vent.
The extractor fan is an Xpelair XID100.
Have you done the calcs for each run?
Looking at it, I would be going for your existing option unless you can somehow show that your 5m run will offer less resistance.
If you go for the vertical route consider using insulated ducting to reduce your reliance on the condensation trap. If the fan is up to the horizontal route that would be my personal preference as you can create a fall to the outlet (after a short rise, suspending the duct from the rafters) so again condensation drains away from the fan and your not solely relying on the trap.
If your discharging the trap to the eaves don't forget to insulate the drainage pipe or at least burry it in the ceiling insulation to avoid freezing
Given that you appear to be using a fairly hefty centrifugal fan, I would go for the vertical, shorter option, but would definitely try to insulate the ducting. If you can use solid ducting tube, rather than flexi-ducting then all the better.
Obviously, short runs of flexi-duct at either end would be fine.
Centrifugal fans can cope with a decent pressure difference, so I wouldn't worry about the 1.5m head that this pump has to lift over.
Here's a link to the performance graphs for that fan:
It looks like it will be a bit OTT, if anything - but better that than not sufficient.