Technical data:
Cutout dimension: 28x28 cm, external dimension: 35x34,5 cm, roof thickness: 2,5 - 5cm, height above roof: 9 cm, inner frame: 32x32 cm
12V vent: 25 watts inout power, 1,9 amps maximum current consumption, 180 mm fan diameter, 50cm2 maximum ventilation
Mounting advice: No drilling on the roof, inner frame is bolted directly to the outer frame