LOL, you got me today man, sorry I missed that you had a laptop, man I'm stupid. I have an acer laptop and the fans goes off and on. So yea laptops are suppose to be quiet so the fan can go on and off. That's why I was thinking what kind of fan if it was for a desktop would go on and off. LOL.
If you want you can set the fan to always be on, I think it's in BIOS setting or if your laptop is an acer check the acer manager.