100% Genuine LG Part. ** Compatible with A906SM. The exhaust filter need to be cleaned at least once a month to maintain the cleaning performance of the product. The frequency of cleaning depends on where and how often you use the product. Clean the filters more often if used in areas with a lot of dust. How to Dry: Natural drying for at least 24 hours. (Drying time may differ by temperature and humidity) Reinstalling the filter before it is completely dry may result in mildew or odor. The exhaust filter need to be cleaned at least once a month to maintain the cleaning performance of the product. The frequency of cleaning depends on where and how often you use the product. Clean the filters more often if used in areas with a lot of dust. 1. Turn the outer exhaust filter counterclockwise to remove it. 2. Clean the exhaust filter with a brush or running water. - To maintain cleaning performance, remove the dust from the exhaust filter at least once a month. - Allow the exhaust filter to dry out of direct sunlight in a well-ventilated place. Reinstalling the filter before it is completely dry may result in mildew or odor.