TDF Flange
TDF is a flanging system that consists of forming a flange profile on the duct ends, thus made out of a sheet from which the duct is fabricated.
TDF is a 4 bolt duct connection system that eliminates time wastage. Rather than using separate connectors to assemble your system, TDF flanges are roll formed onto duct during the Manufacturing process.
https://truestarairsystems.com..../index.php/tdf-flang
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