• PMSM Series is our newest product by own design.
  • HVLS(high Volume, Low Speed) fan, it is a super large energy-saving ceiling fan with diameter up to 7.3 meters (24ft).
  • The airfoil blade is streamlined, which are developed with the advanced technologies and the principle of aerodynamic.
  • Just with a power of 1.2kw or less, the HVLS fan are able to move a mass of air and then produce a large scale of natural wind, which leads to the double functions of ventilation and cooling.
  • Unlike a small, high-velocity fan that creates small, turbulent air streams that quickly disperse. Ifan relies on size, not speed, to move a significant amount of air, it result is a silent, non-disruptive and even distribution of 1~3m/s breezes over large spaces.
Current (A): 3/380V Working Area: 1800㎡
RPM: 0~54 Airflow(m³/m): 15000
Fan Dia(M/FT): 7.3/24′ Power(kw/HP): 1.2


  • It is the secondary cooling effect when air passes over human skin (Similar to a fan created effect) thereby causing a lower temperature sensation.
  • How to make people feel cooling down 5-8℃
  • The running of big diameter fan blade accelerate the air flow, and increase the evaporative efficiency of the sweat on human being, and this evaporation process take away the heat in body, that’s called wind chill effect.
  • As for the specific influence created by different wind speed, please see above graph, which can show you different temperature with different wind speed to make the difference that people feeling.


Usually the ventilation is restricted in a tall and big space, and the exhaust fan can barely work forthe floor or corner of building where people and equipment located, while HVLS fan can solve the problem completely by sending a well-aligned wind in full space, coordinated with the roof ventilator, to improve the air quality and achieve a healthy and comfortable working environment.

Core Technology

HVLS fan can accelerate the air mixing of whole space which helps to distribute and absorb the odors, smoke and humidity very well, thus to improve the quality of air and provide a fresh, arid and safe environment.

Inside Air
30% 40% 50% 60% 70% 80%
Inside Air
27% 35% 43% 50% 58% 65%
Dehumidification 3% 5% 7% 10% 12% 15%
Reduction Rate 10.00% 12.50% 14.00% 16.67% 17.14% 18.75%


Model Fan Dia.
Motor Power
RPM Air Flow
Applicable Area
RTF-DF-7E 7.3/24′ 1.5/2.0 0~54 15000 3 1800 100 36
RTF-DF-6E 6.4/21′ 1.5/2.0 0~54 13000 2.85 1450 92 36
RTF-DF-5E 5.5/18′ 1.2/2.0 0~62 11000 2.5 1100 85 36
RTF-DF-4E 4.6/15′ 1.2/2.0 0~62 9500 2.35 850 77 36
RTF-DF-3E 3.7/12′ 1.2/2.0 0~70 7500 2.1 630 70 36
RTF-DF-2E 2.8/9′ 1.2/2.0 0~70 5500 1.85 400 62 36


Wheel Hub
Motor System
Control System
Fan Blade
Wheel Hub

  • Innovative double bearing design, more durable and steady
  • Imported aeronautic aluminum alloy (AA7075)
  • Forged by 1000T machine with 570Mpa extension strength
  • T6 heat processing

Motor System

  • German imported “NORD” coaxial bevel wheel decelerator with diamter of axle 40mm, to decrease radial force
  • German imported “Simrit” double oil seal design, more durable and reliable
  • “Shell” brand top class “Omala” S4 lubrication oil, Zero maintenance for over 20000 hours
  • IE2 high efficient motor with imported “SKF-VL” bearing, save more 5~10% than IE1

Control System

  • Denmark imported “DANFOSS”VFD(Variable Frequency Driver) inverter
  • IP55 motor protection grade and NEMA 1 standard control box
  • Schneider brand electrical sets, with safety protection module inside which will interrupt the output automatically in case of some accidents.

Fan Blade

  • High strengthaircraft aluminum alloy:AA6063T6511, PVFD processed on surface
  • Patented airfoil design, and special reinforcing rib support system, which increases the strength of fan blade and avoids the sagging of fan tail and fatigue loss of connecting components
  • Customized fan blade color