Purchased this fan after doing some research to find a really quiet fan.  I was willing to pay a bit more for a fan that didn't make a lot of noise.  After installation the fan was totally quiet for about 3 weeks, then it began making a metallic noise, almost like something is loose inside.  We Have taken the fan apart and can't find the source of the noise, but it is extremely annoying and driving us crazy.  Very disappointed after paying what we did for this fan.  The fan looks great, but it is very noisy