I had a new ECM blower installed in my York furnace and now there is a whistle that occurs at the middle speeds. The whistle is just below 1,000 HZ and does not occur at low and high speeds. It's mostly a background thing and not audible upstairs, but I can hear it through the air intake grill downstairs and it's annoying. What is the likely cause of this, and how can I eliminate it?
source https://hvac-talk.com/vbb/threads/2228615-Whistle-in-blower-after-new-motor?goto=newpost
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