![Greenwood Airvac on Twitter: "@spiderbrian17 @SpeedyFreakGame Attached is a copy of the old installation guide for the S90 series of fans, if the unit is making a loud whirring sound then it's Greenwood Airvac on Twitter: "@spiderbrian17 @SpeedyFreakGame Attached is a copy of the old installation guide for the S90 series of fans, if the unit is making a loud whirring sound then it's](https://pbs.twimg.com/media/FBp_tPuWUAIcHqb.jpg)
Greenwood Airvac on Twitter: "@spiderbrian17 @SpeedyFreakGame Attached is a copy of the old installation guide for the S90 series of fans, if the unit is making a loud whirring sound then it's
![Greenwood Airvac AXS100 Bathroom / Toilet Extractor Fan 100mm / 4 Inch - Standard Version (NO Timer) : Amazon.co.uk: DIY & Tools Greenwood Airvac AXS100 Bathroom / Toilet Extractor Fan 100mm / 4 Inch - Standard Version (NO Timer) : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/61Khl5-LoTL.jpg)
Greenwood Airvac AXS100 Bathroom / Toilet Extractor Fan 100mm / 4 Inch - Standard Version (NO Timer) : Amazon.co.uk: DIY & Tools
Greenwood Airvac on Twitter: "@Taid50 Hi David, There is a small round cover in the bottom corner just below the word 'airvac'. Remove the small round plastic cover and there should be
![Greenwood Airvac AXS100TR Toilet/Bathroom Extractor Fan with Run on Timer, White, 4 inch : Amazon.co.uk: DIY & Tools Greenwood Airvac AXS100TR Toilet/Bathroom Extractor Fan with Run on Timer, White, 4 inch : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/61EsXYBe5uL._AC_UF350,350_QL80_.jpg)