This blower can run at CCW direction only.Reverse the impeller running direction can not change the air direction. Filter onto the inlet to protect the blower from dust and water. Keep the environmental temperature as low as possible to make the blower life time longer.Certification: ce, RoHS Warranty: 1 Year After-sales Service Provided: Online support Life time(MTTF): >20,000hours (under 25 degree C) Weight: 886 grams Housing material:PC Motor type:Three Phase DC Brushless Motor Controller: external Static pressure: 11kPaBrand name: Wonsmart High pressure with dc brushless motor Blower type: Centrifugal fan Voltage: 220 VAC Bearing: NMB ball bearing Applicable Industries: Manufacturing Plant Electric Current Type: AC Blade Material: plastic Mounting: Ceiling Fan Place of Origin:Zhejiang, ChinaWS130120S-220-240-X300 blower can reach maximum 95m3/h airflow at 0 kpa pressure and maximum 11kpa static pressure.It has maximum output air power when this blower run at 8.5kPa resistance if we set 100% PWM, It has maximum efficiency when this blower run at 8.5kPa resistance if we set 100% PWM.Other load point performance refer to below P-Q curve:(1) WS130120S-220-240-X300 blower is with brushless motors and NMB ball bearings inside which indicates very long life time; MTTF of this blower can reach more than 15,000hours at 20degree C environmental temperature (2) This blower needs no maintence (3) This blower drived by a brushless motor controller have many different control functions such as speed regulation,speed pulse output,fast acceleration, brake etc.it can be controlled by intelligent machine and equipment easily (4) Drived by brushless motor driver the blower will have over current, under/over voltage,stall protections.This blower can be widely used onto vacuum machine,dust collector,floor treatment machine.Q: What kind of power source shall we use to drive this blower fan? A: Generally, our customers use 24vdc switching power supply or Li-on battery. Q: How to change impeller speed if we use your controller board? A: You can use 0~5v or PWM to change speed. Our standard controller board is also with a potentiometer to change speed conveniently.Brushless motors are found in electric vehicles, hybrid vehicles, personal transporters, and electric aircraft.[9] Most electric bicycles use brushless motors that are sometimes built into the wheel hub itself, with the stator fixed solidly to the axle and the magnets attached to and rotating with the wheel.[10] The same principle is applied in self-balancing scooter wheels. Most electrically powered RC models use brushless motors because of their high efficiency.