3. Life Expectancy: Dual Ball Bearing: 50000 hours
Sleeve Bearing: 20000-25000 hours
4. Standard: Fully CE, ROHS Approved
Packaging & Shipping
Packaging : brown cartons or according to customers advise
1.The sample will be shipped by express, like FEDEX, DHL, UPS and EMS. And the freight should be paid by clients. 2.The mass goods will be shipped by air for any emergency, the freight will deal with you for the concrete condition. 3.Usually,the products will be shipped by sea.
Shipment: 1.FOB Qingdo/Shanghai or any port you appointed for mass production. 2.DHL,UPS,FEDEX,TNT or any other international express for sample or small quantity. 3.Anyway,the more details can be discussed.
Payment: 1.We can accept the Payment T/T, L/C,Western Union and Paypal. 2.The payment for the high value sample will be charged 100% in advance, and will be returned to you after confirming the mass production. 3.The payment for the low value sample can be free, but the freight should be taken by you. 4.The payment for the bulk production should be 30% deposit in advance and 70% balance before shipment.
Provide free samples (not including postage), 3 to 7 days to complete, customized samples need 15 to 30 days .
Qifang Company Brief Introduction a. was published in 1992,has been one of the professional and experienced manufacturers and designers of AC/DC cooling fans in China for about 22 years; b. Production Capacity:DC/AC cooling fan 10,000-12,000 pieces per day;Blower fan 5,500-7,000 pieces per day; c. 12 professional engineers and 2 study labs,8 sets automatic production lines,26 advanced researching&testing equipments; d. Products have obtained the certifications of UL,RoHS,CCC,CE,ISO9001; e. Be popular with two registered trademark “QF” and ”QFDJ” across the world.
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Q1:Are you a factory or trading company? A:We are a factory.Our factory is located in Zhengzhou city, Henan Province, China, about half an hour car ride from Zhengzhou Airport .All our clients are warmly welcome to visit us!
Q2:What are the products of our factory ? A: The products are Dc cooling fans , Ac cooling fans, Blower cooling fans, Cpu cooling fan, VGA cooling fan.Our fans from 40mm-220mm . We can also do cooling fans as customers' requirement.We are honored to offer you samples.
Q3:What characteristics determine the lifetime of the fan? A:In a well designed fan, the lifetime of the ball bearing is the limiting factor in the lifetime of the fan. Bearing life is related to the size of the bearing, the speed of the fan, the load of the fan, the grease used, and other factors.
Q4:What is the relationship between RPM and airflow? A:RPM and airflow are directly proportional. In other words, increasing RPM by 20% also increases airflow by 20%.
Q5:What is the relationship between airflow and voltage? A:Within normal operating range fan speed will increase with increasing supply voltage. Airflow will increase as a direct function of fan speed.
Q6:What can we do to lower the noise level in a fan? A:1) Lower the RPM or the fan operating speed (this also lowers airflow.) 2) Check for obstacles in front of and behind the fan. If they exist, move the fan farther away. In general, obstacles on the intake side of the fan negatively impact the noise level more than on the exhaust side.
Q7:How does your factory do regarding quality control? A:"Quality is priority. Quality control people always attach great importance to quality controlling from the very beginning to the very end. Our factory has gained CE, RoSH, CCCcertification.
As for the products. we have passed CE CCC ROHS cetificates.
Our sincerity business commercial ethic is :''the business principle of best quality,customer always the first".
Sincerely welcome to contact us to made a good cooperation with us.