extractor fan roof vent

Is there a gable end you could route to instead?

Tony

traditional flat clay tiles with a double overlap. I need to

Well there is, it was my original idea, it is the other side of the house, about 5 metres away. The fan is sufficient for that. Maybe that is a better idea after all. Simon.

Thats put me on the right track. The magic phrase seems to be "In-line Tile Clay Vent". Comes up with several that look like they replace 3 tiles wide and two tiles deep. Cheers, Simon.

Read a bit on the net where it was saying that if an extractor was routed upwards through the roof it was advisable to run it for 10 minutes longer than one would with a horizontally vented system so that there was little prospect of condensation in the pipe running back into the fan

Tony

Yeah, despite the distance a horizontal run to the gable may be better. It is also more sheltered there so less chance of wind noise

- I would use a downward-facing cowl. Also, I could ensure the pipe after the fan was slightly downward-facing so no probs with condensation. Just means I have to put a hole though the wall. One core drill coming up ! Simon.

In message , TMC writes

I had a loft mounted fan, venting via flexible ducting into a vertical pipe through the roof. Never had any such problems, if there was small amount it would ahve just pooled in a low bit of the duct.

But how would you decide on how long is long enough, to decide on the extra 10 minutes? - ours was operated by a humdidistat.

If you are worried a better idea than indeterminate extra venting would be to find a condensate trap.