Place the silicon ring around the edge of the inner access door panel, making sure that the thicker side is between the two access door panels.
Apply the self-adhesive template on the duct wall
at the desired position.
Turn the knobs till they hit the stops and insert the inner door panel inside the opening at an angle. Then straighten the door, pull it lightly to center it and tighten the knobs.
Installation video RD with SI (up to +80°C)