How do I install TDC/TDF corners without smashing them or bending the flange?
For TDC/Ductmate, the corner pieces help hold and locate the flange joint, but they are not what makes a crooked run acceptable. Get the duct sections level and aligned first, with gasket on one flange face only, then seat the corners and tighten evenly. A corner can look a little ugly and still work; a duct run that is twisted, racked, or out of level will keep fighting every joint after it.
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.
Check
Use a dedicated TDC corner tool or a drift pin (alignment punch) to align the corner bolt holes perfectly before inserting the bolt. Never try to smash a misaligned corner home using a framing hammer-you will bend the gasket seal area, creating a permanent h
Steps
Use a dedicated TDC corner tool or a drift pin (alignment punch) to align the corner bolt holes perfectly before inserting the bolt. Never try to smash a misaligned corner home using...
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how do i install tdc/tdf corners without smashing them or bending the flange?