B-Line Eaton series imperial cable tray and ladder, 6" Height, 36" Length, 18" Width, 18" and 6" Tray widths, Series 2-5 horizontal reducing tee, Alum

It joins an 18 inch wide run to a 6 inch wide branch. The main body is 18 inches wide, and the reducing side drops to 6 inches, so it is the fitting to use where a branch run leaves a main tray at a smaller width instead of matching it.

Plan on 36 inches of length for the fitting itself, 18 inches across the main, and 6 inches of side rail depth. With a 24 inch radius turn built in, the branch sweeps well out from the intersection, so lay it out before you cut your straight sections.

Aluminum. That keeps the weight down for overhead support spacing and is the usual choice where galvanized steel would corrode. The fitting weighs 26.2 lb, which is worth knowing when you are planning trapeze hangers around the intersection.

It carries CSA certification, so it can be specified on Canadian projects as well as US work. That is the only listing mark stated for this fitting.

Order it as Eaton B-Line 6A-18-06-HT24. The number breaks down the way the rest of the imperial series does: 6 inch rail, 18 inch main width, 06 inch branch, horizontal tee, 24 inch radius.

A reducing tee does both jobs in one fitting, taking the 18 inch main and turning off a 6 inch branch in a single 36 inch piece. Using a full width tee and then a separate reducer adds two more splice joints and more length in the ceiling. Go with the reducing tee where the branch width is already known at layout; keep the straight tee if the branch may later be widened to match the main.