Using your rangehood filter material is easy. First, measure your rangehood to see what size filter you need. Then, cut the white synthetic filter and the black charcoal filter to the right size using a sharp pair of scissors. Place the white filter on the side that will catch the grease, usually closer to the cooking area. Put the black charcoal filter behind it to remove odors. When it comes to maintenance, check the filters regularly. If the white filter looks full of grease or the black filter doesn't seem to be removing odors as well, it's time to replace them. Keep them away from direct heat and moisture to make them last longer. You can trust these filters to keep your rangehood working well and your kitchen smelling fresh, just like we've been trusted to supply quality appliance parts for over 25 years.