A round gas duct tee is needed to connect a round duct branch of an air duct to the main pipe of the air duct.

    Tees must comply with standards and can be of two types:
  • 1) the diameter of the branch is less than the diameter of the header;
  • 2) the diameter of the branch is equal to the diameter of the header;

When constructing non-standards big diameter tees, it is necessary to calculate the border along which the connection between the tee branch and the tee header will pass. The designed lateral curved surface is cut out on a steel sheet, and then the sheet is wrapped into a round cross-section duct. The maked tee branch is attached to the round duct and welded.

On this page you can use an online calculator that will calculate and draw the surface of the tee branch.

Unfolded lateral surface of branch of straight duct tee.
It is cut out on sheet metal with further circular rolling.

round duct tee
Inner diameter (D) of tee branch
mm
Branch wall thickness (s)
mm
Number (n) of split points of surface
point
You can download a free program for working with files with the .dxf extension   here
You can download the DWGTrueView thumbnail viewer   here