Fans always on in Boot Camp
You are correct that OS X always idles a blower/fan if they are present. 

I thought it was always 2k RPM on stock hardware, but you might be correct on the 1300 RPM number - I don't have data on that specific hardware.

I doubt it's bad since Apple selects the components and probably has really great data on what percentage of failures are due to manufacturing variations and which are excessive wear on the components.