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...Suburban sheet metal ltd mailing address physical p o box s eden rd kennedale tx phone fax duct fabrication specifications construction page of table pressure classification for ductwork static class inches pa w g rectangular style a std stv round flat oval flexible notes denotes standard nonvariable volume air operating requirements regardless actual in velocity level compliance with this document up to all cases which the designer does not over designate system independent fan rating variable ducts when application see on other classes or installation details are given and available designation selection contract documents prepared by designers is acknowledgment acceptable design including any section sealing related overpressure underpressure conditions that may occur during normal special modes operation number tables suitable maximum pertains less than straight fittings except equipment portion receiving components inserted into from systems such items governed separate text refer...