No matter the name, branches are still the same — a 'leg' is coming off the mainline.
All US Duct branches are 18 gauge or heavier, which enables us to weld the branching part to the trunk to ensure a very tight seal. US Duct offers single, double, T, and Y branches, which are also known as Lateral, 'Pant', T on taper and/or Y-branches.
Our duct branches are compatible with clamp together duct; US Tubing, our airtight tubing product; and flanged ductwork.
Typically, Single and Double Branches taper as the new line enters the mainline. This is because the new line is bringing in more air. The exit part of the branch (toward the fan) is, therefore, bigger to accommodate the increase in air. The new line typically enters at 30 or 45 degrees so as to 'merge' into the airflow.
Ts are called Ts because the line enters the main line at 90 degrees — forming a 'T'. Ts are not the best airflow for negative systems as they increase static pressure to the point that the air can slide right by the sideline and pull only from the straight end where the flow is 'easier'. Ts, however, are often used in positive systems — where the air is being pushed.
Ys are exactly that — Ys with the two inlets diverging from the centerline. Once again, the volume of the outlet is the sum of the two inlets. Typically the two inlets are the same size. If one needs to be smaller than the other, the branch is made with the two inlets equal to the largest requirement and then a reducer is used to reduce to the smaller requirement.
In-cuts are used to create a branch on an existing trunk line. To create a new branch with an in-cut, a hole is cut in the pipe at the location of the branch. The in-cut is saddled over the hole and fastened with tech screws and caulked.