When I talked to someone from Broan, the maker of vent fans, about how loud my bath vent fan was, they gave me the name of the independent lab that they were required to hire to get the rating that go on their label they said that the same lab gives them the numbers that they use for the energy stare label.
So far everything that I've tested with my Kill-a-watt has been dead on for energy usage, other then CFL light bulbs, they are always higher, every single one.
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