PORTLAND, Ore. – The results of SPIDA’s testing on the performance of flat-oval duct will soon be released. That was one of the news items to come out of the Spiral Duct Manufacturers Association’s ...
The Spiral Duct Manufacturers Association, better known as SPIDA, is an organization focused on promoting the use of round ductwork and flat-oval duct. The organization is comprised of nearly 90 ...
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