Duct leakage test report 2025

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The test attempts to measure the CFM25 value for leakage in the duct system to outside of the conditioned space. Standard: The measured duct leakage must not exceed 0.06 CFM25 x floor area (in square feet) served by the system.
When low-pressure VAV and CAV systems are used, the total allowable leakage should not exceed 2 percent, including the box and downstream ductwork. The box and downstream ductwork should be tested at the lower 1-inch wg static. This is the minimum for most systems currently used in todays design practices.
510.5. 6 Duct Leakage Test The leakage test shall consist of a light test, water pressure test, or an approved equivalent test. The permit holder shall be responsible for providing the necessary equipment and for performing the test. Such test shall be conducted in ance with ASHRAE 154.
Based on the protocol for Total Leakage Testing, or Leakage Testing to Outdoors duct leakage in new construction shall not exceed 0.06 CFM25 x floor area (in square feet) served by the system for leakage to outdoors or 0.08 CFM25 x floor area (in square feet) served by the system for total leakage.
The ENERGY STAR Version 3 Rev 11 air leakage criteria specify that duct air leakage must be 4 CFM25 per 100 ft2 of conditioned floor area or 40 CFM25, whichever is greater, at rough-in or 8 CFM25 per 100 ft2 of conditioned floor area or 80 CFM25, whichever is greater, at final.
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ASTM E779 Standard Test Method for Determining Air Leakage Rate by Fan Pressurization. ASTM E1827 Standard Test Methods for Determining Airtightness of Buildings Using an Orifice Blower Door. ASTM E3158 Standard Test Method for Measuring the Air Leakage Rate of a Large or Multizone Building.
A duct leakage tester is a diagnostic tool designed to measure the airtightness of forced air heating, ventilating and air-conditioning (HVAC) ductwork.

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