GILVENTUS EC MIX FLOW INLINE FAN is an extremely low profile inline fan with jet-engine blades design and metal housing. Combined with an EC motor for no-humming, no vibration, smooth operation and the most energy-efficient performance. It is an outstanding fan in the market because of its high efficiency, resulting from a built-in multiphase brushless DC motor design, sending this compact inline fan to high speeds and a high static pressure rating as well as maintaining a lower level of power consumption. Included in the box is an 8 speeds controller for maximum flexibility. We also offer optional wireless controllers or smart controllers which are sold separately. HALF POWER CONSUMPTION OF TRADITIONAL DUCT FANS It is an outstanding fan in the market because of its high efficiency resulting from a built-in multiphase brushless DC motor design, sending up this compact inline fan to high speed and bringing a high static pressure rating as well as keeping a lower level of power consumption. MULTIPLE-WAY OF SPEED CONTROL Every Sigilventus inline duct fan comes with a standard speed controller utilizing PWM (Pulse Width Modulation) and DIY speed control wires for any ventilation system or devices supporting PWM/0-10V/Potentiometer/Tachometer signal, and also adaptors for supporting other controllers such as G.A.S and PrimaKlima. Meanwhile, we also offer an optional wireless controller, and a smart controller, which are sold separately.