The blade of the roof axial fan is aluminum alloy casting. It is with aerofoil blade, which is rigid, light and adjustable within 25°to 50°of angles. There are a variety options available.

There are 2 options available in terms of material(enclosure) of the ventilator:

1. For model made of aluminum, it is generally intended for buildings that can not support heavy objects.（Optional models begin from GXF2.8 up to GXF7.1）

2. For model made of steel, it is generally intended for buildings that can support heavy objects.（Optional models begin from GXF2.8 up to GXF12.5）