I cant exactly tell you the answer to the amount of fans, maybe wait for someone more technically minded to come along, or try googling it? Of course it would depend on what you were using your macbook for, but I think they are effective. I only just got my macbook and haven't felt heat on my legs at all, and I mainly use it on my lap, which I guess means that the fans are working efficiently?
Shop for your Apple, Mac, iPhone and other computer products on Amazon.
We are a participant in the Amazon Services LLC Associates Program, an affiliate program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.