it's always good to seal the duct joins with metal duct tape to allow full air flow to the farthest rooms.
but not in a situation of changing out the furnace only.
and what a scam...to control dust...gotta laugh on that one...
make sure you get a good high efficiensy furnace too. 88% at least. not the lower end at 72% i think it is. he can tape the joins at the new furnace connections for say about 15 bucks in tape.
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