The recent thread about whether these make a noise or not has reminded
me of a question I have about these.

We have an extract whose outlet faces downwards through the soffits,
is there any sort of draught prevention that can be fitted to this or
will I have to do it in the ducting somewhere? The outlet is
rectangular if that makes any difference, most of the duct is round.

--
Chris Green
·

On Sat, 13 Mar 2021 10:11:26 +0000, Chris Green wrote:

The recent thread about whether these make a noise or not has reminded
me of a question I have about these.

We have an extract whose outlet faces downwards through the soffits,
is there any sort of draught prevention that can be fitted to this or
will I have to do it in the ducting somewhere? The outlet is
rectangular if that makes any difference, most of the duct is round.

Our tumble dryer vent goes from the machine via a snort length of
round flexi ducting to the round to rectangular converter, though 90
degrees, up the wall to the ceiling then out though the wall to a
grille. In the rectangular outlet section is a flap (that from memory)
is pivoted on either side and just over centre vertically so it flaps
up easily from the airflow of the TD. In the many years it's been
there it's never been an issue or made a noise.

(Manrose Flat Ducting Pipe Connector With Damper - White, 110mm x 54mm
40270).

If there was any part of your rectangular duct that was horizontal you
might be able to use the same? I think they also do spring loaded
versions that pivot in the middle (like butterfly wings) that might
work vertically?

Cheers, T i m

Chris Green explained on 13/03/2021 :
We have an extract whose outlet faces downwards through the soffits,

The only none electrical ones I have seen, all rely upon being vertical
in a wall and need gravity to close them/ air flow to open them.

In message , Harry Bloomfield
writes
Chris Green explained on 13/03/2021 :
We have an extract whose outlet faces downwards through the soffits,

The only none electrical ones I have seen, all rely upon being vertical
in a wall and need gravity to close them/ air flow to open them.

There are *spring close* versions but the springing must be very light
and I think they are limited to horizontal fitting.

We both need the *wax stat* version:-)

--
Tim Lamb

Tim Lamb was thinking very hard :
We both need the *wax stat* version:-)

I have a wax stat version on our bathroom extract, it works rather well
and never any wind noise.

On 13/03/2021 18:23, Harry Bloomfield wrote:
Tim Lamb was thinking very hard :
We both need the *wax stat* version:-)

I have a wax stat version on our bathroom extract, it works rather well
and never any wind noise.
Of got a fan with a waxstat shutter in it, in the utility room It works
well. I ought to do the same for the bathroom as that lets in a cold draught

--
If I had all the money I've spent on drink...
...I'd spend it on drink.

Sir Henry (at Rawlinson's End)

Chris Green wrote

The recent thread about whether these make a noise or
not has reminded me of a question I have about these.

We have an extract whose outlet faces downwards through the
soffits, is there any sort of draught prevention that can be fitted to
this or will I have to do it in the ducting somewhere? The outlet is
rectangular if that makes any difference, most of the duct is round.

My powered shutter is inside. The external grill isn't shuttered
and is just there to keep birds and mice etc out of the duct.