Using this Westinghouse rangehood charcoal filter is easy. First, make sure your rangehood is turned off. Then, locate the filter area in your rangehood and remove the old filter if there is one. Take your new ACC069 filter and align the central mounting hole and twist - lock slots with the corresponding parts in the rangehood. Twist it gently to secure it in place. Once it's installed, you can turn your rangehood back on and enjoy fresh, odor - free air. As for maintenance, it's a good idea to check the filter regularly, about once a month. If you notice a decrease in its odor - removing ability or it looks dirty, it's time to replace it. Remember, this filter is not washable. Store the filter in a dry place if you're not using it immediately. And always refer to your rangehood's user manual for any specific instructions.