I'm building a 10" mirror cell and plan to have a cooling fan blowing on the back of the mirror. I read the article by Brian Greer here
about airflow requirements and 15 to 25 CFM is recommended for a 10" mirror. I want to be able to control (reduce) the fan speed in case there are vibration issues or if the fan is just plain too noisy. Based on the fans I'm seeing on amazon, I'm a bit stuck with two questions:
1. Can I control the speed of a fan by simply changing the input voltage using a variable potentiometer between the fan and the battery?
2. Do I need a 3 pin fan to do this or will a 2 pin fan work just as well?
My short list for fans contains these two...any thoughts of which is better or are there other proven fan choices to consider?
I'm leaning to the second fan because it is rated much quieter. I'm assuming low noise also indicates low vibration?
Thanks for any advice you can offer!