EnviroVent SIL100T Silent Extractor Fan 100mm Model comes with Backdraft Shutter and Adjustable Timer - John Cribb & Sons Ltd, UK Electrical Distributors, Dorset, Hampshire, Wiltshire, Somerset & the Isle of Wight.
Envirovent SIL100T SILENT-100T Timer Extractor Fan for Bathroom or Toilet 798256074073 | eBay
How to install a bathroom extractor fan Silent-100 CZ Design - YouTube
Envirovent SIL100T SILENT-100T Timer Extractor Fan for Bathroom or Toilet 798256074073 | eBay