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The only way to really quiet the furnace is to isolate it from the other room with big thick walls and a solid door. This will of course mean that no air from the room can get to the furnace. You can put an air vent into the furnace room from some other room. As I suggested above, the air for...

I take it that you have a gas-fired furnace? It may be pricey, but you can have the air for the firebox vented in from outdoors. almost noisless!