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Measuring air loss isn't something you see in the typical residential or commercial project but it's something I do all th etime in certain more-specialized types of facilities. Even small openings can create a pretty sizeable loss, if you have enough of them, so don't dismiss it. It's a lot harder than you think to build a really tight room, or duct.
To answer the initial question, it would depend on the type of duct work that is installed. Some types leak more then others. You'd have to inspect them, then measure the losses, before making a decision. You'd also be wise to test the integrity of the whole house. Considering the climate, the efficiency of the installed heating and cooling system, etc. all plays a part in whether it's economical to seal the ducts, or if something else would give a better bang for the buck.
The technology is out there, if you want to use it.
JR
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