amazing what a change in the weather can bring.
Instead of worrying that the fan was not clearing hot air fast enough, I can
now feel a cold draught coming in through the fan.
I have looked for an external vent which has a one way flap, but Screwfix at
least do not seem to offer one.
I am also concerned that any such arrangement would require a reasonable
positive pressure to open the vent, and so would cut down on the effeciency
of the fan.
Is there a good one way valve for an extractor fan, or would you need
powered (or cord activated) shutters on the fan body itself?
I can remeber the old VentAxia window fans where you pulled a cord and the
shutters opened and the fan went on, and also have vague memories of powered
versions which opened the shutters automatically.
Brrrr....soon be Christmas.
You're getting a bit lazy mate, the check list in this group is always BES,
TLC, Screwfix & then B&Q if desparate ;-)
Have a look at:
I've got a similar design on a pretty wimpy ducted fan & it's ok.
It doesn't appear to be a problem on mine, the flaps are light and fall back
by gravity (no springs). TLC also have one you can put in the duct:
but I don't have experience of this type and don't know how the shutters
If you have a steady wind blowing onto the vent you might want to use an
outlet with downward facing opening combined with the in-line backdraught
shutter. Hopefully the downward facing outlet would catch the wind less.
Sorry, no link for that one, but I have seen them in the wild, perhaps the
sheds or builders' merchant.
Ah, those were the days . . . . . , now where's me tea, zzzzzzzzzzz . . . .
On Tue, 23 Sep 2003 13:38:04 +0100, "David W.E. Roberts"
I got a Manrose fan for my downstairs toilet from TLC. It has shutters
which automatically open but they're not very effective at keeping the
cold out. Every winter I seal it up. It's also on a sheltered side of
the house. It's a good fan for extraction though. Keeps all the toxic
gases contained. You really feel the wind round your ankles when
you're sat having a crap, and the toilet roll wafts around in the
I put a similar fan in the bathroom. Similar, because although it
looks identical, on this one the shutters take a good few seconds to
open after turning it on, and then slowly close on turning off. Don't
know why they made it this way. Anyway, as the bathroom is south
facing and direct in to most of the wind, I attached a right angle
elbow of ducting to the outside of the house. It's of square section,
about 8ins, galvanised steel and painted to blend in, with some
deflectors inside to guide the air round the bend. I put some fine
mesh in a frame and stuck it over the outlet, to keep birds and wasps
from nesting, and spiders out. It works surprisingly well. Very little
draught detectable, if any. I 'acquired' it from work when some
contractors were in doing some air conditioning installation, so I
can't help you locate any.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.