This question already has an answer here:
I am currently using 1 12V 0.95A fan to circulate air in my humidor (coolerator) and using an AC adapter rated class 2 120V 60/60 with an output of 9V 300mA. Can I add 3 more fans with the same power source or do I need to increase power?
2 days later:
I have 4, of the pre stated fans connected to the aforementioned source. They surge but do not start without spinning them manually and then run very slow. What do I need to power them up?