Spiral oval duct measuring 150 inches by 60 inches is unique to us, as well as our patented AccuFlange connector. To our knowledge there is no other equipment manufacturer or fabricator that has ...

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 ...