R
Ron
Guest
Here`s a thing, my bathroom fan - standard through wall 4.5 inch kinda
thing - makes a thrub thrub thrub noise when operating. It's a similar
sound to when a plain bearing is worn out, and you can see the blades
slowing and speeding up rythmicaly roughly once per second. The fan is
wired so that it starts when the bathroom light is turned on, and
continues for several minutes after the light is turned off.
but...
When I turn out the light - a single 60 watt incandescant bulb, the fan
behaves normally - no pulsing or noises - for the remainder of it`s time.
One other thing, this only happens when it`s windy outside, on a calm
day it behaves normally.
I have one or two theories of my own, but I wonder if there`s any
informed comment (or wild guesses) from the brains trust as to why this
should happen?
Ron(UK)
Crossposted to uk.rec.sheds cos it`s the kind of thing people in sheds
like to sagaciate about.
thing - makes a thrub thrub thrub noise when operating. It's a similar
sound to when a plain bearing is worn out, and you can see the blades
slowing and speeding up rythmicaly roughly once per second. The fan is
wired so that it starts when the bathroom light is turned on, and
continues for several minutes after the light is turned off.
but...
When I turn out the light - a single 60 watt incandescant bulb, the fan
behaves normally - no pulsing or noises - for the remainder of it`s time.
One other thing, this only happens when it`s windy outside, on a calm
day it behaves normally.
I have one or two theories of my own, but I wonder if there`s any
informed comment (or wild guesses) from the brains trust as to why this
should happen?
Ron(UK)
Crossposted to uk.rec.sheds cos it`s the kind of thing people in sheds
like to sagaciate about.