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6.4.4.2.2 Duct Leakage Tests
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Ductwork that is designed to operate at static pressures in excess of 3 in. of water and all ductwork located outdoors shall be leak-tested according to industry-accepted test procedures (see Informative Appendix E). Representative sections totaling no less than 25% of the total installed duct area for the designated pressure class shall be tested. All sections shall be selected by the building owner or the designated representative of the building owner. Positive pressure leakage testing is acceptable for negative pressure ductwork. The maximum permitted duct leakage shall be
Lmax = CLP0.65
where
| Lmax | = | maximum permitted leakage, cfm per 100 ft2 of duct surface area |
| CL | = | 4, duct leakage class, cfm per 100 ft2 of duct surface area per in. of water0.65 |
| P | = | test pressure, which shall be equal to the design duct pressure class rating, in. of water |
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