Last May there were 12 grills and this year there are at least 12. Some this year are being taken out, used and put back in the unit, also the one at Building 14 is hidden under a bush and not easy to see. So in summary: Nothing has changed in the last year.
These 4 grills are still here from May of 2009:
1501, 1110, 1106 & 1114.
These units no longer have grills:
1505, 907 & 1402
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