In the plastic Flash 3300 the flap is made of high-quality, two-layer polycarbonate. In several daylight versions of formply air inlets, the cover is made of 25 mm thick polycarbonate. This air inlet also features 4 air chambers. For optimal insulation, the air chambers are fitted with a PVC U-profile around them.
The installation and adjustment of our daylight vents is the same as for normal vents.