Ensure you can continue to sleep well with filtered air by replacing the filters on your Silentnight Air Purifier. This replacement filter is designed for the Silentnight 4 Stage Air Purifier, and helps to remove 99.9% of airborne allergens including dust, smoke, pollen, pet odours and more, to ensure you can breathe smoothly through the night. The replacement unit comes with 3 filters in one. This consists of the pre-filter, to catch larger particles and protect the more delicate HEPA filter, which catches the vast majority of smaller particles. Additionally, there is a carbon filter to filter gases such as smoke and odours. These filters can provide a clean air delivery rate of up to 80m3/h. Replacing your filter is easy – unlock the base of the purifier by twisting it. Remove the old filter, then remove all packaging from the new filter before fitting it in place. Once fitted, secure the base by twisting and locking it back into place. Given that the filter operated at maximum effectiveness for around 1200 hours, please be sure to replace your filter every 6 months to ensure your purifier operates at its best to deliver you a great night’s sleep.