Dome-shaped skylights are usually divided into three categories according to the opening method of the sash, side-opening dome-shaped electric lighting and smoke-exhaust skylights, dome-shaped fixed skylights and dome-shaped electric lighting and smoke-exhaust skylights (upper opening). Among them, the former window sash is opened sideways; the dome-shaped fixed daylighting skylight window sash cannot be opened; the latter window sash is opened upwards.

The side-opening electric continuous rooflights has multiple functions of ventilation, lighting, rainproof, fire-fighting and smoke-exhausting. Because the sash facade is opened sideways, the opening angle is generally about 70°, and the effective ventilation and smoke exhaust area is the window opening area, so the ventilation and smoke exhaust performance is better. 

The dome-shaped fixed smoke vent rooflight has good lighting performance. Its round arch structure increases the strength of the lighting board, and has good self-cleaning properties, which can prevent dust accumulation, water accumulation and snow accumulation. This type of skylight is placed on the base and is not directly connected with the roof steel plate, which can effectively avoid the hidden danger of water leakage caused by the inconsistent thermal expansion coefficient of the resin plate and the metal plate.
The domed type electric smoke exhaust ventilator (upper opening type) has good lighting performance and fire-fighting smoke exhaust performance. The arc top is provided with an arc opening sash. When the sash is fully opened, the angle between the opening sash and the horizontal plane is ≥80°, and the effective smoke exhaust area is close to the area of ​​the sash hole. Therefore, the ventilation and smoke exhaust performance is better.

The three dome-shaped electric lighting and smoke exhaust skylights all have good lighting performance, can withstand large loads, and have good self-cleaning properties.