What do contractors mean when they talk about Straight Duct and Fittings in Rectangular Duct Fabrication?
Straight Duct
- One Piece sections of straight duct with Ductmate Flange on ends , corners inserted. When it arrives on job site, the duct film on ends will be removed and the sections will be connected to each other with Butyl Gasketing, 6” Cleats and 3/8” Carriage Bolt/Nut
- One Piece or full wrap duct, TDF profile on ends, corners inserted
- L sections of TDF Duct, corners inserted
- Two piece duct, also referred to as L Section or Knocked Down means each shipment can accommodate more duct but also means more labor on the job site. This is Snaplock rectangular duct; Female Buttonlock seam on left, male Buttonlock flange on right. Snapped in on job site
Fittings
- In a Rectangular Duct System, Fittings means everything other than the straight duct runs like these various duct sections formed with Pittsburgh lock, duct film on ends
- Offsets and Radius Fittings with Pitts locks, duct film on ends
- Offset Fitting with sharp turn, Duct Liner and weld pins visible inside
- Large Radius Elbow with Radius Throat, both heel and throat seamed with Pittsburgh Lock
