Blue stones? I'd bet it's petrified critter poop! :-D On Mon, Jul 26, 2010 at 4:50 PM, Charles Lee <Chaz at properproper.com> wrote: > Interestingly, when I removed the right lower shroud, I found about a pound > of blue stones (road gravel ?) fell out, only on the right side ? Like > someone used the fan as a cement mixer ?