The round/flat-oval spiral duct system will be more efficient overall ... Others limit the use of gaskets to 24-inch diameters and larger sizes are installed with flanged connectors. In deciding how ...

Milwaukee, Wisconsin – AGI Fabricators, a leading name in precision metalwork and HVAC component manufacturing, has ...

Ryan Barnes of Sheet Metal Connectors, Weldon Weeks of M&M Manufacturing. Photo by Emell Derra Adolphus. The Spiral Duct Manufacturers Association (SPIDA) was formed to promote the use of round duct, ...