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
They come in all shapes and sizes:
Chris Green explained on 13/03/2021 :
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 <s2ichr$jhv$ snipped-for-privacy@dont-email.me, Harry Bloomfield <?.?@harrym1byt.plus.com.invalid> writes
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:-)
Yup. Mine was one of those. A very light spring, and the whole shebang mounted in a horizontal duct.
Tim Lamb was thinking very hard :
I have a wax stat version on our bathroom extract, it works rather well and never any wind noise.
Chris Green snipped-for-privacy@isbd.net wrote
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.
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
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