Using your Westinghouse rangehood aluminium filter is easy. First, make sure your rangehood is turned off and cooled down. Remove the old filter from your 900mm canopy type Westinghouse rangehood and replace it with this new one. Ensure it fits snugly in place. When it comes to cleaning, it's a good idea to clean the filter regularly to keep your rangehood working efficiently. You can soak the filter in warm, soapy water for a while, then gently scrub it with a soft brush. Rinse it thoroughly and let it dry completely before putting it back in the rangehood. If you're not sure which model your rangehood is, always double - check with us before purchasing. And remember, this is just one filter, but you'll need 3 in total for your rangehood to function properly.