Using this rangehood filter material is easy. First, measure your rangehood to make sure the 120cm X 50cm size fits. Then, carefully place the white grease - trapping material in your rangehood. As you use your rangehood, the material will start to trap grease. Keep an eye on it. When it looks clogged with a lot of grease, it's time to replace it. You can simply take out the old piece and put in a new one. For maintenance, always store the filter material in a dry place. This will help it stay in good condition until you need to use it. And remember, even though the packaging might look different, the product inside is the same quality.