Solution for furnace knocking...
As some of you may know, I had to remove the furnace last winter to get it fixed. Well, in the removal and re-installation process, I must have done something that caused the furnace to start making knocking noises.
These noises were a consequence of thermal expansion and contraction of the exterior metal skin. My solution? Eighteen inch long pieces of angle aluminum and some epoxy. I glued the angle aluminum to the exterior skin where I could push it in (slightly). Now, the skin is rigid and no more noises.
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