Definition:

Roof exhaust fans come in various specifications and forms, with a wide range of applications. They can be selected based on different requirements for the occasion of use, air volume, pressure, and noise.

The fans are classified into the following three types:

A. Axial-flow roof exhaust fan: Model DWT-I, suitable for medium to low pressure and high flow rate applications. Depending on user needs, it can also be designed as a bidirectional reversible supply and exhaust fan, featuring equivalent performance in both forward and reverse operating conditions, such as Model DWT-V.

B. Centrifugal roof exhaust fan: Available in two models, DWT-II and DWT-III, suitable for applications requiring lower air volume but higher pressure.

C. Turbine exhaust fan without motor: Model DWT-IV, an ideal energy-saving ventilation device that uses the pressure difference between indoor and outdoor air to drive special arcuate blades to rotate around the axis, thereby exhausting indoor air.