Manrose inline extractor fans

BrokenJetpack

So I have a ceiling fan in my upstairs bathroom that's given up the ghost. It was vented into the attic but not out through the roof or eaves, just a hole in the insulation where it disperses (bad I know 😕). I've been looking at a replacement and I came across a Manrose brand that's an inline fan type, mounted on a joist. Couple of questions:

- are these inline fans better than the ceiling mounted ones? Are Manrose a good brand?

- would most electricians be happy to crawl into the corner of an attic to fit them?

- is it ok to vent it out through a vent tile in the roof?

- is there anything else to be aware of, like I read about moisture going back down through the ducting if It's pointing upwards?

Tia

Calahonda52

How well ventilated is the attic.

Roof tile vents are hard to retrofit correctly and the cure might be worse than the disease.

If they are not correctly flashed they let rain in

If its close to the side of the house you might be able to put the vent in the soffit, with a well supported semi circular loop

In line may not have a backdraught flap and if mounted on the joist may vibrate

BrokenJetpack

https://www.boards.ie/discussion/comment/124069113#Comment_124069113

Thanks, I think it's reasonably well ventilated in that it's pretty cold up there and always seems a bit draughty. That's a good call re venting through the soffit, hadn't thought of that👍️

greenbin2

I had a similar setup and I piped it down (dormer) and out thorough soffit and facia

It was useless, took hours to reduce humidity, so a few years later I sealed up the vent, and drilled a new one out the side wall of the bathroom

hargo

I put one in over 20 years ago, piped it out through the soffit and it works great. Previously had ceiling fan straight into the attic and it was useless. It has been left on by mistake for hours several times and no issue with it burning out. One warning I was given at the time if you are using a flexible pipe make sure it is well supported so that you don't get a build up of water in one place as it may burst eventually, using a 100mm pipe over a long distance is best.

Calahonda52

https://www.boards.ie/discussion/comment/124090828#Comment_124090828

Wrong re long distance, pressure loss on a long pipe will reduce the effectiveness

long L / small D = big impact eg

1m/.1 = 10

vs

.5/.15 = 3.3

[Long L + big D = sin urlár eile ar fad!}

OP, fit a 6" fan on a timer