AP Series 100sq ft Front Access Skim Filter

The surface area will need to be completely flat. In most cases, you would leave the top horizontal cut in the acrylic slightly higher so that the housing can slip in from the front, no more than 10mm. You will need to pilot through the acrylic shell once the unit is in place. Assembly with plenty of silicone including the screw holes. There is a rear fixing template included the screws wind in to.