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While replacing my F10 microfilter, I noticed pieces of the coarse filter embedded in the microfilter. When I inspected the blower housing, I noticed that the coarse filter had a hole in it.

Part: 64119216222
http://www.realoem.com/bmw/enUS/showparts?id=FR73-USA-06-2010-F10-BMW-535i&diagId=64_1680

Touching the coarse filter caused it to crumble even more. I have attached photos of the old and new housing cover and a closeup of the coarse filter. I am surprised with the quality of the coarse filter and how easily it crumbled.

For those of you under warranty, consider getting this inspected.
 

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