What is the noise I hear when first starting the car?

Probably a stupid question here, but my curiosity compels me to ask. When I first start my car in the morning or after an extended amount of time (ie after work) the engine starts and sounds normal however there is what sounds like a fan spinning up that lasts for about 10-15 seconds then it shuts off and I hear a click of a relay in the dash. I'm curious what this is. Anyone?

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Mine Looked Exactly like this from Lowes when I bought them...

Hehe, cool, they look like an exhaust from afar, wasn't sure if they were axle tube covers. Now I know. I was thinking of getting a pair of these. But they are a bit pricey for what they are.

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