I have an Expelair 9 inch extractor fan fitted in my kitchen. It has a
time delay on opening of 30 to 50 seconds, It now takes about 10
minutes. Understand this is due to a faulty wax actuator, Thinking of
replacing the fan with one that fits flush with the wall ie. The
Expelair WX 9 which costs about £230 plus fitting.
Is there any other make (9 ") that would come a bit cheaper and be
Er - you sure about that?
We've had an Xpelair in our kitchen for, oh, 15 years. Every year or
two the time it takes to open the vents (after the fan has started) gets
up to a few seconds. So I take it apart and clean all the accumulated
gunge off the slats of the vents -- there's one hell of a lot of grease
accumulates on these things you know.
It's extremely easy to take off each vent assembly (inside and outside,
though only the inner has moveable slats on ours). I use turps to clean
the grease off - works like magic. Then the slats open instantly when
the fan is switched on.
Sorry if this is all barking up the wrong tree ... I've never heard of a
"wax actuator" ... perhaps it's something that XPelair added in more
recent years as a sales booster. You know - the kind of the thing that
the marketing people insist that the engineers add to their previously
flawless design :-P
I don't know about Xpelair, but wax actuators are commonly used
on bathroom fans with operated vent flaps. They look like a small
solenoid, but are actually a heater operating a plunger (don't
know exactly how the wax bit works inside). They don't operate
with a loud bang on switch-on, which is useful if you need to
use the loo at 3am without waking up half the street. There's
typically 30-60 seconds delayed operation as the heater heats
"Andrew Gabriel" wrote
| I don't know about Xpelair, but wax actuators are commonly used
| on bathroom fans with operated vent flaps. They look like a small
| solenoid, but are actually a heater operating a plunger (don't
| know exactly how the wax bit works inside).
The wax expands when it gets hot, pushing out a piston. The same things are
used (without the electric heater) to open/close greenhouse vents
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