Well I found my model number, googled it and came across the instructions on how to modify the fanspeed - it involved wires on heat, cool and several parked ones, so you just put the differnet color on heat that corresponded to the speed you wanted.
IE: black is high, red is low, yelow med-hi, brown med-lo.
However, it was already on med-lo, so I put it to high and there is a lot more volume coming out of the vents, so I'll try that for the winter and see how it goes, but it certainly didn't help the noise, I guess its more reverb in the vents from the HE furnace.
Is there any way to quiet down the reverb (vent noise) from an HE furnace ?
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