Extractor fans are noisy beasts and there are many situations where silence, as the old Tremeloes song goes, really is golden! Actually it can be very important, especially if your fans are close to living quarters and can cause a disturbance during both day and night (more irritating at night!). So you need a good silencer, and the Carbon Garden Silencers should fit the bill. These models have been carefully tested to make significant reductions in noise and are made of rigid construction. Check that the size of your fan is appropriate for the measurements given here. It will make a real difference to the amount of noise your fan makes, and you can get a range of different sized silencers as well to match how large your fans are.