Filter kits will include all the parts needed to set up the filters in a 48x30 downdraft sanding table.
My plans will give you a head start in your sanding table build. These are not step by step "IKEA" plans, but rather a tool to use in conjunction with the video.
This is the same template I use in the video. It is used with a plunge router to make consistent sized and spaced holes.
Some of the screws I use to build the table are only available in bulk packaging. If you only want to buy exactly what you need, then these kits are for you.