I just installed an Aprilaire 500 humidifier on a Rheem Classic 90Plus furnace. When the humidifier is running (and not the furnace -- the humidifier is just turning on the blower) there is a lot of noise that is really annoying...sounds like a high-pitched paper shredder. When the furnace is running, no problem. Any suggestions? A few notes: I can tell that the noise is coming from the top of the blower unit-part of the furnace. The wire I used connections is a slightly lighter gauge that what is used in the furnace...does that make any difference (and why would it make the blower noisy?)?