At 10:29 PM 5/5/2012, Alistair Bell wrote:
>yeah, I agree. But... sometimes you find all the foam has degraded
>almost completely. Just like some loud speaker foam

Right.  I just don't think those particular flaps need to have any at
all, that its major function is to make them quieter when they slam
shut.  Anyway, I didn't notice any loss of flow or any whistling
noises after firmly rubbing all the loose residue off at least two
sets of them.  But the slapping noise when you suddenly turned the
fan to max might have been a bit more pronounced.  Which was fine
with me, I like being able to hear them when I want to.

:)
d