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we just paid 1800 dollars to have envirospect thoroughly clean our heating ducts, only to find that a fine, black metallic dust is still blowing out of our registers…most likely because of rust from previous unknown water damage. now we’re being told that we’ll have to replace all ductwork in our 4 story house…we have a forced hot air gas system. any good experiences out there with this kind of job? who did you use? thanks.