First @HappyBaba did a refill on my filter as it was time.So took some pictures for you to give you an idea of how mine is constructed.
Front
Back side with one edge cut back just so i can get it past my lights “tight fit”
Disassembled and how much carbon im using for this thing
Filled wiuth one of the squares of filter material going down first also i have a fill line for the carbon but just coincidence a 16oz cup is right around the right amount.
Taped back up, i pre fold the tape to 90 degrees as it makes it easier to stick it in place to get it in the corners
Then i just slip it up and into place and a magnet that was drilled and glued into the roof holds it in place apart from the sides of the fan holding it too.