Positioning of extractor fan vent & humidity sensor

[Adam Funk]

This is for an offshot bathroom in a mid-terrace, with a level ceiling over the main area but a slope down over the sink & shower/bath, to fit a ducted fan in the ceiling going to a vent that has already been fitted in the outside wall (above the ceiling). There's a fairly large hatch to the side for access.

The controller includes an RH setting & can be set to run for a specified time from the light switch.

I guess the intake vent/grate should go in the flat bit, as close to the middle of the bathroom as possible?

Where are good places to put the humidity sensor?

The outlet vent has shutters pulled down by gravity when the fan isn't running, so is an in-line anti-back-draft device not needed?

Thanks, Adam

[tabbypurr]

as close to the source of the problem as possible. Ideally right by the bog pan. Some people have even plumbed the extract fan to the pan, but that creates a few issues. If no toilet, near the bath/shower.

anywhere except corners, where air doesn't move as much. Ideally in the middle.

right. Although those shutters are far from perfect in windy conditions. Powered shutters are much better.

NT

[Davey]

Agreed, our gravity shutter rattles in windy weather, but we can live with it rather than replace it.

[John Rumm]

Somewhere you can easily reach it to make adjustments, since you will need to tweak the settings from time to time as the weather changes or if you have a particularly damp few days etc. There is no particular need for the sensor to be in the centre etc.

Its worth having just to stop the external ones clapping open an shut so often in the breeze.

[Adam Funk]

I'll see (or hear or feel) how it goes. I didn't get one with the other stuff, but there's enough room up there to add one later.

[Adam Funk]

Thanks.

Do you put it between the ceiling grate & the fan or between the fan & the outside grate?

[John Rumm]

the latter.

[Adam Funk]

That's what I would've guessed, but it never hurts to check.

[tabbypurr]

I don't see it making much difference.

NT