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Powder puff test for heat exchanger?
My boss recently gave us techs a little “test kit” for checking heat exchanger integrity. It consists of a little rubber bulb filled with a very fine powder and an attached rubber tube. The idea is to have the furnace set to off with just the fan running. You squeeze a little puff of powder into each chamber entrance and if the powder blows back he wants the furnace condemned. I haven’t found any info on using this powder test anywhere online and nobody I know has used it for checking exchangers.
Any thoughts on this “test”?