When the flooring guys sweet up before laying the flooring, some "labours" think the cold air returns are a good place to sweep dirt into, as opposed to bending over and picking it up. Doesn't happen all the time but I've built a few homes to live in and everytime the first thing I check is what was swept into the furnace. 2 empty tape rolls, a pile of sawdust and some random plastic to date...
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WENDIE 99