Utilities and energy agencies may offer duct testing services. The 30 percent penalty from duct leakage should be no different. Details, Details All references to leakage are given under test conditions at 50 pascals air pressure. The actual pressure in ducts ranges from as little as 10 pascals at the registers to over 100 pascals near the air handler. The leakage numbers may or may not apply to actual conditions.
All measurements reflect leakage from ducts to the outside of the building.
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