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A duct blaster. The vents are all sealed up to prevent them from leaking. A duct blaster is a fan that pressurizes the duct system to find out how much it leaks. The leaks are then sealed as best as possible by the homeowner or a contractor and retested.
An energy auditor will typically own a duct blaster, but be sure to ask. A complete energy audit generally costs between $400-700. Google energy auditors for your area and see if your local utilities offer a reduced rate for energy audits. If so, see if duct blasting is included.
The actual gauge to measure the pressure or leakage is a manometer, these can be used with a duct blaster or a slightly different kind can be used to measure flow out of a particular duct.
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