There are two types:600/900 (APQ-600A, APQ-900A for the diamond-shaped roof, APQ-600B, APQ-900B for the arc-shaped roof).The skeleton uses 1.2mm or 1.5mm galvanized steel sheet disposable stamping mold, The skeleton with high strength and this equipment parallels with the roof , two types of ventilation are both  below 800mm height . This kind has many advantages , such as unique internal structure, beautiful appearance and easy- installation, combining lighting and ventilation exhaust into one body,This equipment can be applicable to all types plant requiring daylight and  exhaust. 
The equipment components are the integrated pieces with excellent water-resistant effect.

      Diamond-shaped natural lighting roof ventilator                                        Arc-shaped  natural lighting roof ventilator

APQ-600A, APQ-900A type diamond-shaped roof ventilator  sectional view      APQ-600B, APQ-900B type arc-shaped roof ventilator sectional view

 Natural lighting ventilation size

 Natural lighting ventilation exhaust reference value