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 24 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 “NMB-QFC” across the world;
f. Company's website: http://qfdj.cc/
Shipping: 1.Delivery Ways: DHL ,UPS Door to Door service ,By Air ,By Sea ,etc. 2. Sample lead time:5-7 days . 3.Mass production : Delivery Time :2-3 weeks
Q1:Are you a factory or trading company? A1: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 ? A2: 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? A3: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? A4: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? A5: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? A6:1) 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? A7:"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, CCC certification. Please browse our website with your mobile phone if you want to know more.
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