Duct Construction Standards
entire duct system. Pressure in ducts near room air terminals is nearly always below 1/2” w.g. *Asterisks indicate wording that is taken directly and verbatim from the SMACNA HVAC Duct Construction Standards, 2nd ed., 1995. SMACNA TABLE 1-2 DUCT SEALING REQUIREMENTS Seal Class Class Sealing Required Static Pressure Construction Class A
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