DWT-I axial roof fan adopts wide twisted inclined blades, achieving required air volume and pressure at low speed with low noise.It has 17 sizes from 300mm to 2400mm, with air volume of 1500–220000m³/h and total pressure of 60–320Pa. Blades of size 12# and above are adjustable for energy saving and multi-working conditions.Explosion-proof and anti-corrosion types are available for flammable, explosive or corrosive environments. It supports two-speed motor or variable frequency stepless speed regulation (25–50Hz recommended). Manual/electric dampers and self-closing louvers are optional.