Vortex Fan Aluminum Series
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http://www.overbr.com.br/Outro destaque sobre o projeto da VORTEX Aluminum Series recai diretamente sobre a inclinação das ‘pás’ da hélice, elas são ligeiramente mais fechadas (inclinadas para a parte interior) e o resultado desta pequena modificação é imediatamente refletida na pressão estática que o ar oferece
http://www.overclock3d.net/Would I buy them?  yes I would, especially when you bring price into the equation.  with the 120s coming in under a tenner, and the 140's not much more they certainly represent good performance at a great price, and price is something we're all having to think more about these days.  Now if I could only find a way of gagging the Aluminium Vortex I wouldn't be afraid to take her out in public.
http://www.madshrimps.be/Prolimatech has now an interesting set of fans on the market, three which are 120mm and four 140mm. Some of the models carry red LEDs and others have blue LEDs and the manufacturer has also made available an aluminum model, optimized for high airflow and pre-equipped with a fan guard for safety. In this article we will learn about their appearance, the bundle they come with, the minimum startup voltages, the noise they produce and how many RPM they have at certain voltages.