Kennedale tx 76060 phone 817 478 0801 fax 817 483 6571 page 6 of 43 sheet metal standards duct guage and enforcing for 1 ess drive heavy ga metal gauge of metal duct dimensions 5 joint 4 joint 2 5 joint 2 joint. Ansi smacna 006 2006 hvac duct construction standards metal and flexible sheet metal and air conditioning contractors national association inc. An exterior duct sealant is defined as a sealant that is marketed specifically as forming a positive air and watertight seal bonding well to the metal involved remaining flexible with metal movement and having a service temperature range of 30 f 34 c to 175 f 79 c.
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