**ALL MODELS ARE 2 Speed Fans - except fort th 400mm which has 3 Speed Fans.
The new Max Fan Pro Series – the second generation of Max-Fan – is a diagonal fan, using the 3D rotor-stator system, which has been improved to be more efficient and more silent.
The multi speed switching allows growers to seasonally adjust the economically regulated air flow control. Fans have distinct “sweet” spots in their running speeds. The German research into this has enabled these specific speeds to be accurately identified to give constant optimal efficiency.
The design of the fan makes it very compact and easy to use, as the ventilation duct adapter is integrated into the mounting brackets. You just have to mount the adapter first and then fasten the fan with two screws.
Due to the speed switch, the Max-Fan Pro Series is the most inexpensive version to regulate air performance manually.