Recommended gages for circular ducts for heating and general ventilation work. By conducting joint performance testing as described in section vii of the smacna hvac duct construction standards 2nd ed 1995 it was found that in some tests the ward angles e h and j permitted a more liberal interpretation of the smacna tables. Smacna standards and manuals address all facets of the sheet metal industry from duct construction and installation to air pollution control energy recovery and roofing.
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