Fixed Domes are Dome Rooflights that do not need to open for ventilation nor access. This means the unit is closed (fixed)
Fixed Domes can be supplied with Manual Trickle Ventilation though which is installed into the upstand (2 Sides) to allow small amounts of ventilation in spaces intended to be naturally ventilated. Ideal in Bathrooms or Kitchens.
If you need your Dome Rooflight to open for ventilation please see Opening DomesDimensions in the 'Fixed Domes' section refer to the Internal Aperture size.