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Mend Greenwood Airvac Fan Noise Turn Light

Bathroom Extractor Fan Knocking Noise on Overrun?

Hi my bathroom extractor fan is a greenwood airvac, and when i turn off the light switch the fan continues to pull air for 15mins on an overrun. However, as soon as this kicks in a loud knocking noise comes from the fan casing.

With the light on this doesnt happen, so i would assume the speed slow down causes something within the case to flap. I have cleaned out the fan but the noise still occurs.

Can anyone advise on a similar problem and/or solution?!

Thanks
Mark

Mark Lyall
October 2008
GreenwoodGreenwood AirvacCooling, Electric FansFan Noise Turn Light
The fan runs at the same speed on over run as it does normally. Get in touch and get the fan exchanged

i know this as i am Greenwoods Quality Technician.

Hope this helps,

Karl Turrell
January 2010

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Greenwood Airvac Fan Noise - Knocking on Overrun