High pitch whine when furnace starts...

Recently I've noticed that our furnace makes a high pitch whine when starting up, but once the flame is going, the whine seems to stop. (I have noticed 1 or 2 occasions in the past week where the whine would come back even with the flame on)

I think it's coming from the Induced Draft Blower (the part at the top of the furnace that seems to blow air into a rigid metal duct.) Can this part be oiled? If so, what kind of oil do I use and where do I oil it?

Thanks.

 

Sounds more like a loose fan belt.

 

Draft inducers have been known to squeal. They run under extreme heat and are very rarely oilable. Most of the bearings are considered sealed and a motor replacement may be in order.

 

Same thing happened to me. I had some "bearing lube" that I dripped into the bearings (they were accessible on mine). You'll want to order one soon though as mine degraded very quickly after that point (couple weeks). Be careful when you swap it though, since it is generating a lot of heat from the friction of the failing bearings, it will be HOT. Even after having the furnace off for a bit, mine was scorching when I went to pull it.
On the whole though, it was a VERY simply swap out for me, the only hard part was making sure I got the right part. I'm sure all furnaces are built differently but I have little to no experience with furnaces and felt comfortable doing it.