I am looking to install an extractor fan for a bathroom project.
Based on Vent Axia calculator and others, the cheap and cheerful 4" wall
mounted versions pushed by the sheds is somewhat lacking.
I am therefore conidering an in line fan with 5 or 6" ducting via the loft
to an end wall outlet.
My questions are:
How to terminate the duct through the wall - previously I have used a wall
terminal kit consisting of an external grill, a wall sleeve and a spigot
plate so that the ducting can be taken from a fixed connection at the wall.
I am struggling to find one for ducting larger than 4".
Can anyone recommend a supplier, or advise a suitable alternative?
Vent Axia offer a mixed flow fan ACM range. These look pretty good but I am
being quoted £110 (+ £35 for timer) for a 6" version!! Are they worth the
Any general advice on ducting installation would be gratefully received.
The alternative is to fit two 4" fans, which are cheap and readily
In our main bathroom we have two in-line fans.
One grille in the ceiling is over the loo, the other over the bath.
They use flexible pipe to connect to the in-line fans in the loft and then
discharge out of plastic vents in the soffits.
When using ducting, always use a centrifugal fan. Axial flow fans get good
flow rates, but are unable to produce a significant pressure differential,
which is what is need to promote flow through a duct. Centrifugal fans may
produce lower flow rates, but they can really push against resistance, which
is what is needed here.
On Wed, 20 Aug 2003 09:04:48 +0100, "TheScullster"
guide as a downloadable .pdf file from the Domus website when I was
working on a kitchen (I also wanted a larger than standard duct and
components.) I think their website will be www.domusventilation.com
I could not find anyone who held stocks of the parts but once I found
their number for a kit, I was able to order it through a local
builders merchants who stocked the standard size components.
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