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Need help troubleshooting attic fan

12 years ago

Hello. The original whole house fan that was installed when we built our home (1994) quit working. I found a new motor with same physical dimensions except slightly bigger in HP. Original motor was 800 RPM and the new 1070 at high speed. I installed new motor with original fan blades, however, there is very little puling of air through the house. Fan blades were installed correctly and I've tried switching the wiring for medium and slow speeds, still no pulling of air. Rotation of shaft is also correct and when I hold a piece of thread under the fan, it does not pull it up until I hold it very close. Our original fan would pull ashes out of the fireplace if we had no door or window open, but nothing with new motor. Also, the new motor seems to get extremely hot with little use. I cannot figure out why there is a problem or what else I can try. Can someone please offer some insight? Thanks so much, Mark

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