On 08/10/2020 14:16, Chris J Dixon wrote:
Fredxx wrote:

On 08/10/2020 13:39:49, Andrew wrote:
Is it better that it is positioned close to the inlet vent or close to
the outlet? Better or pushing or pulling air around?

I would suggest noise should be the deciding factor.

Noise is best kept at the source and not above a bedroom. Power may also
be another consideration.

After recommendation here, I bought one of these:
http://www.tlc-direct.co.uk/Products...ENTslashT.html

Admittedly not cheap, but I was amazed by how quiet it was, I had
to feel the air to be sure it was running. You can't even hear it
in the bathroom, certainly not elsewhere.

It is screwed to a board across a couple of joists, and there
seems to be no discernable direct transmission. The mounting
bracket includes some rubber isolation material.

The airflow is far better than the (failed) cheap one it
replaced. It can push-fit into the pipework, and is readily
removable for cleaning.

Chris

That is the one that I have to install - except it is the 4inch version.
Matches the diameter of the roof vent.