hey gang have a property for rent and just showed the place a few mins ago the person looking at the place asked me about the last replacement of the ceiling tiles he stated there is a expiration date on the tiles and it is code they be replaced on this date for deteareation reasons well this is not something I ever heard of so he pulled a tile out of the grid and sure enough there is a date from 5 years ago does anyone know of this and do I really need to replace my tiles thanks alot Mark
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