John Rumm wrote:
Richard Sterry wrote:

...then it would appear to be defying the laws of physics! If the ducts
are clear, the outlet grill is clear, the recirculate/extract lever is
in the right position, and the fan is going round at a decent speed,
then it MUST draw air through. If air is not being drawn through, then
one of the previous assumptions/observations must be wrong.

Unless it's the unknown factor 'X' of course. ;-)

Like a burnt out or shorted motor winding? It would still spin but with
far less force....

Well, the original poster said it "spins round at an impressive rate", but I
guess that's purely subjective - depends on how easily impressed he is! ;-)

Rick