Germany NORD motor Germany REXROTH inverter Large coverage area 3 years warranty Aluminum Alloy Hub Place of Origin: China Certificate: CE MOQ: 1PC Unit Price:$2000 to $2500 Delivery: Within 8 days after order confirmationSIYI ceiling fan is a kind of large fan with very big diameter from 12ft to 24ft, which is called high volume and low speed (HVLS) fan. Compared with normal ceiling fan, the difference is that SIYI HVLS fan is 2 to 5 times bigger, and the speed is 2 to 5 times slower than normal ceiling fan. But SIYI HVLS fan can move about 20 times more air than normal ceiling fans. The important parts like motor and VFD are NORD and REXROTH brand, which are both imported from Germany so as to ensure SIYI fan with high quality. SIYI HVLS large ceiling fans are used in large facilities, warehouses, distribution centers, farms, large retail stores, sports arenas, stations, airports and other large buildings, and become an ideal choice for ventilation, cooling and dehumidification of large indoor space.Detailed SpecificationsModelSYD48Fan Diameter4.8M (16FT)Airfoil MaterialAluminum AlloyAirfoil FinishesPlastic SprayingWeight116KGHeight1.1M (3.3FT)Number of Airfoils6PCSController includedYesVoltage220V/380V/415VFrequency50HZ/60HZRPM(min/max)20/55RPMPower1.5KWCoverage area800M²Warranty3YearsProtectionIP55Blades The blade is the core technique of the fan. We use simulation software ANSYS to make the blades with most reasonable transversal surface and inner limiting plate. The limiting plate is also very important. If it is not settled in the right place, it will make the blades shake or even broken. SIYI fans have six or eight PCS of blades and winglets to ensure maximum airflow and efficiency. Unique designed winglets at the airfoil tips greatly eliminate wind noise. The blades is made of aluminum alloy with plastic spraying finish, so it can resist corrosion and dust very well. SIYI company invites Germany designer to analyze and test the blades. We found the ratio between length and weight must be settled within 410-425 to ensure the blades will not be broken forever. So it is unscientific to make the blades too thick or too wide. PackingOne fan is packed into two wooden cases. 1)20*30*230CM 2)30*40*90CM