EDITOR'S NOTE: Material for this article was taken with permission from the Sheet Metal and Air Conditioning Contractors' National Association's (SMACNA's) 1995 HVAC Duct Construction Standards (metal and flexible). For information about the association, or its standards, contact SMACNA at 4201 Lafayette Center Dr., Chantilly, VA 20151-1209, or call 703/803-2980. We've all heard the stories, and many of you have no doubt seen the installations where the flex duct ...
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