wrote in message ...
flashgorman wrote:
Hi,

I have a hood type extractor fan over my hob. Lately this has given up
on
its extracting duties. When I turn it on theres the usual whizzing
noises
but no air is being sucked up into the hood. I took the cover off the
hood
and removed the filter (pretty clean). There's a big fan that spins
round at
an impressive rate but I can't feel any updraught of air into it. I
climbed
on to the kitchen roof and checked that the vents are clear and you can
feel
a slight draught coming from the vent.

Any clues?

Are you sure it really used to work?

Indeed. It makes a lot of noise and the sucking-up-ness used to be
impressive to behold.

If it really has got worse there's not much that can go wrong, check
that the fan is spinning at the right speed, clean the filter
thoroughly

Tried it without the filter at all and still no joy


and then the only remaining possibility that I can think
of is a nest or some such in the duct.

Have removed top of the ducts (appear to be two) on the roof and can't see
anything. If I disconnected the pipe from the top of the fan should I then
be able to feel the fan sucking up (and hence prove the pipe is blocked) or
will it suck without the pipe?

Chris Green