* The 3D casing construction. The construction serve thermal protection, reducing machine noise, absorbing vibration and avoiding air leakage, and are easily assembled and reassembled.

* The motor is air-cooled hermetic 3-phase asynchronous type or external rotor type, which has higher reliable and longer lifetime. Optimized design makes the motor more efficient and energy saving.

* High efficiency air filter

There are plate filter and bag filter two types, both of them have firm structure and long working life.

* Low noise and long lifetime fan equipped with NSK or SKF taper sheath bearing.

*Heat exchanger uses unique pipe layout, and can improve 10%-30% of heat exchange efficiency than that of heat exchanger with same area and traditional pipe layout.