Using your K&N Universal Air Filter is easy. First, find the right spot for it in your equipment according to the air intake design. Make sure the rubber flange fits snugly to ensure a good seal. When installing, be gentle with the flange to avoid any damage. As for maintenance, check the filter regularly, especially if you use your equipment in dusty or dirty environments. When it gets dirty, simply wash it with a mild cleaner and let it dry completely. After that, it's ready to be reused. Just remember not to use harsh chemicals as they can damage the filter material. Also, always double - check the fit after cleaning to make sure it's still secure.