![]() ![]() The most common flexible air ducts and air connectors are listed up to 2500 Pa maximum positive-pressure ratings and anywhere from 125 to 500 Pa negative-pressure ratings, but there are listed flexible ducts with pressures as high as 4000 Pa and as low as –3000 Pa.Īir conveyed by a duct adds both static pressure and velocity pressure loads on the duct’s structure. Negative-pressure flat oval duct systems can be designed by using 2500 Pa sheet gages with the negative-pressure rectangular duct reinforcement members mechanically attached or welded to the duct. ![]() The classifications are from SMACNA (2005) for sheet metal ductwork, and NAIMA (2002a) for fibrous glass duct board. ![]() Duct construction static pressure classifications typically used on contract drawings and specifications are summarized by Table 1.
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