Furnace making sounds ("drip" like) - how can I fix it? I have a soaring efficiency furnace that seem to make "dripping" sounds...

I have a soaring efficiency furnace that seem to make "dripping" sounds contained by the air ducts when the aficionado motor starts up and after the furnace stops running. My HVAC guy said it runs fine, but this is my first winter in the house and it's getting pretty annoying. Any concept on how to fix it?? Also, this is in a manufactured house (built contained by 1994). Any help would be great.

Thanks!
What is the actual extent of the joist?
Answers:    this is probably condensation. the atmosphere ducts are not properly insulated
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your furnace may make that roar. maybe the nouns is traveling through your ducts from your furnace. if it is coming from the ducts itself, theres a problem.
;.your furnace will have a trap on the side of your furnace that holds the condensation , and sometimes will get a glugging noise