Is it normal to hear my Macbook Pro's fan?

i have a early 2011 MBP , and never really heard the fan until about this past week. Im not very technical but i installed iStat Pro . my CPU is about 41 , the fans are about 1998 rpms, and they stay around that area. Also i dont run a lot of intensive things at once only mail and firefox most of the time.

Likely because I have so many peripherals hanging off my MacBook Pro, my fans usually run at around 4000rpms, but I don't actually 'hear' them until (like now) they rev up to 5500-6000rpms. When I'm not using my MBP as a 'desk' model, my fans will usually run in the 2000-2200rpm range and I defintely can't hear them then.
Your fan speeds are normal but you shouldn't be able to actually hear hem - you may have some dust and debris clogging the fans. There are various methods to clean the fans and exhausts that can be found by Googling.
Clinton

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