Before screwing your louvre galleries to your window reveals, ensure that the frame is completely square. Simply check each diagonal corner to corner is equal in length. This will ensure proper operation of the mechanism and no tapering gaps between the louvre blades.
Before screwing in the vertical frames – if adding weather stop bead or strips to base and top of louvre gallery to make them completely watertight, take care to make allowances for them (ie. factor in the depth they'll require in the frame) before securing vertical frame. The base weathership should be placed internally and the top, externally. Be careful with placement, so as not to affect complete closure of the mechanism, which leaves an unintended air gap between the glass blades.
Screw the galleries (vertical frames) to your reveal ensuring each side is exactly parrallel to the other and levers facing inwards. Given the reveal is ‘Plumb’ on all sides, this can be done by marking a guideline down each window jamb at an equal distance from the edge of the jamb.
Now simply slot in the glass. To make blade insertion easier spray the ends of the glass with soapy water. Ease back the ends of the plastic retaining clips and slide your louvre blades in from the inside. Start from the top and work your way down for safety on a large window.
If you are installing a weather stop bead, first lock the blades shut then position the beads. They should be close, but not pushing against the blades. At the bottom position it inside and run a bead of sealant under the stop bead prior to fixing for a better seal. At the top place the weather stop on the exterior and at the base, on the interior.