Performance characteristics: 
Reasonable hydraucone-type design, low noise, big air volume, strong ventilation strength with low operating cost; 
Imported bearing, high strength, low noise and durability; 
Adopts air forward flow principle composite pvc blind window or aluminum shutter with antioxidant, light-weight, no deformation, easy closing and opening, prevent backflow of air; 
High-strength aluminum-magnesium alloy belt pulley with reinforced ribs, light-weight and high strength and high toughness; 
There are both vertical type and incline-type air fans, which could satisfy effectively different site demands;