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Where should a ***** humidifier be mounted?

Should a whole-house ***** humidifier be mounted to the duct coming out of the furnace's fire box (adding humidity to the air right after it is heated and on it's way to be circulated throughout the house)? Or should it be mounted to the cold-air return duct next to the furnace (adding humidity to the cold air just before it is heated and circulated throughout the house)? Or does it really matter either way? Thanks:confused:

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