About Fan

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AC Fan/DC Fan/EC Fan/Blower could be thought of air pump that utilize power from a motor to output a volumetric flow of air at a given pressure. AC Fan/DC Fan/EC Fan/Blower are moving sufficient air to convert the heat energy to the ambience.

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2-1. AC Fan & DC Fan:The most obvious difference between AC Fan and DC fan is the type of electricity that they use. DC Fan use direct current(DC) electrical flows which could only move in one direction. AC Fan use alternating current(AC) charges that can change direction quickly.

2-2. EC Fan: EC Fan: EC stands for “Electronically Commutated”. EC Fan combines AC Fan and DC Fans’ voltages bringing the best of both worlds. The motors runs on a DC voltage, but with a single phase 230V AC or three phase 400V AC supply. The non-rotating part of the motor(stator) is extended to make room for an electronic PCB board which includes power transformation AC to DC, as well as the controls.

2-3. Blower: A centrifugal fan with a high pressure ratio(output pressure/input pressure) is known as a blower. Blowers deliver a high volume transfer rate with a relatively greater pressure ratio. The pressure ratio of a fan is below 1.1 while blowers have a pressure ration of 1.1 to 1.2.

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Fan(AC Fan/DC Fan/EC Fan) produce a gas flow with less pressure and larger gas volume, while blowers produce a relateively higher pressure ratio with larger gas volume flow.


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The Air Flow of AC Fan/DC Fan/EC Fan/ Blower correspond to the volume of air moved through the fan in a set interval. Thus, it is a very important parameter for us. In most data sheets, the typical parameter is CFM(cubic feet per minute) or m³/h (cubic meters per hour). Be careful while compare AC Fan/DC Fan/EC Fan & Blower’s specifiation.

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In essence, the Air Pressure of AC Fan/DC Fan/EC Fan/Blower in a point in the ventilation system is the atmospheric pressure inside the duct on the exhaust side, and as air moves from high to low pressure, air is expelled from the duct. This results in a reduction of pressure in the duct on the other side of the AC Fan/DC Fan/EC Fan/Blower so that it is lower than atmospheric pressure, causing air to flow into the system. Known as static pressure, refers to the AC Fan/DC Fan/EC Fan/Blower on the intake side and the pressure difference between the air outlet end, usually in millimeters water column (mmH2O) or inches water column(inchH2O).


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For many users, the drawback of merely looking at a specified acoustic specification of AC Fan/DC Fan/EC Fan & Blower is that it is hard to image how unbearable that number is in the real world. Typically, the Noise Level unit of AC Fan/DC Fan/EC Fan & Blower is either specified in dB(decibel) or dB(A). Where is the Noise Level of AC Fan/DC Fan/ EC Fan & Blower comes out? Mostly, it was affected by motor, bearing, wind sound and etc.

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There are 2 main types of AC Fan/DC Fan/EC Fan and Blower bearings that are ball & sleeve bearings. Before selecting the bearing, we must consider the fan life span, operation temperature, lubrication & cost. Since AC Fan/DC Fan/EC Fan and Blower stability is the most critical factor in fan performance, it is important that a fan run consistently for a number of years. Sleeve bearing is around 30000 hrs at 40℃ shorter than ball bearing is around 50000 hrs at 40℃.

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From the fan spec, you will find a PQ curve on drawing. P stands for Pressure, Q is CFM of its AC Fan/DC Fan/ EC Fan and Blower. The PQ curves predict the pressure-flow rate performance of each AC Fan/DC Fan/ EC Fan and Blower. Choose a fan that has its peak efficiency at or near your operating point.


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9-1. Caculate the watts consumption you would need to dissipate?

9-2. Confirm the environmental temperature and target temperature.

9-3. What is the acoustic noise of AC Fan/DC Fan/EC Fan/ Blower you need? 

9-4. Confirm the AC Fan/DC Fan/EC Fan/ Blower dimensions.