Motor Structure: external rotor motorinducted by a running capacitor, with impedance protection . Motor protection: Thermal protection automatic switch Blades: Pressed from metal armor plate, blades are welded to motor rotor directly and surface is oven baked printed. Frame material: Die-casting Aluminum Alloy with anti-corrosion treatment. Bearing Type: Double NSK ball bearing Insulation Isolation Grade: F Protection Grade: IP 55Dielectric Withstand Voltage: AC2, 500V, at 0.5mA, 50/60HzAllowable Ambient Temperature: -25 to +85 Centigrade degree (operation) (Under unconcretionary) -30 to +90 Centigrade degree (storage) Noise Lever: 43-64dB at normal operation (Varies to other specifications)Life: 50,000hours Power supply connection: PA-10 terminal connection Unit weight: 2.2kg Contact with us for more details of specification.