How SMACNA Closed an Important Ductwork Standard Loophole
SMACNA steps in to clear up confusion over proprietary DCS addendums for Slide-On (Ductmate, etc.) and Rolled-On Connectors (TDC and TDF) during the ‘90s, writes SNIPS Contributor and Industry Icon David Daw.
In the first section of the ‘90s, I mentioned there were some positive developments. One I had a hand in: the first totally automatic machine for inserting both TDC and TDF corners into TDC/F flange constructed ductwork – the Cornermatic® machine. The other is the addition to the rectangular duct construction tables in SMACNA’s 1995 DCS (Duct Construction Standards) as T-25a/b, known in the trade as TDC/TDF.
There were other developments with duct line additions: in-line tie-rod hole punching and new breaks (wrap) that would break the duct three times eliminating one seam to close up. Later this would set the stage for an additional Cornermatic® machine, the Combo. But first, the corner inserter machines.