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PostPosted: Sun Oct 29, 2017 9:33 pm 
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For anyone searching this product and chancing on this post, I comment:

Yes, the fan is fairly quiet.

However, how quiet may be subjective. The unit is equipped with a horizontal acting 'flapper' valve at its outlet, and when it is windy outside this mechanism can make a loud and very annoying 'clicking' sound.

In an attempt to alleviate this, I replaced the plain external grille I was using (not part of the unit supplied) with one which has both a down-facing cowl and its own internal flap. (You can get them with just gravity flaps).

The effect of this is to make the "silent" fan much noisier when it is operating. Nuff said.

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PostPosted: Sun Oct 29, 2017 11:34 pm 
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silent is subjective really
you would off course expect a "silent fan" to be almost inaudable in deed it may be fully silent
but then you get the fan is silent but the airflow or vent disturbing the air is not inaudible but the fan is :dunno:

we are all ------------------still learning

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