Description
EZ Plenum EZLP18-3S-TB 18 Inch 3-Slot Linear Plenum Box (Assembled)
The EZ Plenum EZLP18-3S-TB is an R-6 insulated fiberglass plenum box made to sit behind a 18 inch 3-slot linear slot diffuser. It gives the supply duct a clean, sealed chamber to feed the grille, so air leaves the slots evenly along the full length of the diffuser instead of blowing out of one end.
This is the assembled version. It arrives as a finished box, so the installer only has to connect the branch duct, set it in place and seal it to the grille.
Key features
R-6 fiberglass construction. The box is built from R-6 fiberglass duct board, so it holds back condensation on the plenum and keeps conditioned air from losing temperature above the ceiling.
Sized for 18 inch 3-slot grilles. The 18 x 4-3/4 in duct opening lines up with Texas Buildmart 18 inch 3-slot linear diffusers with 3/4 in slots.
Ships assembled. The box arrives built and ready to set above the ceiling, so there is no fabrication on the job.
Standard 12 inch height. At 21 x 7-3/4 x 12 inches overall, the box fits the plenum depth found in most drop ceilings and framed soffits.
Checking the fit
The duct opening measures 18 x 4-3/4 in and the box is 21 inches long, 7-3/4 inches wide and about 12 inches tall. It is built to the Texas Buildmart 3-slot pattern with 3/4 in slots. Grille makers vary slightly, so compare these numbers against the submittal for your diffuser before ordering.
Where it is used
Linear plenum boxes are the standard way to feed slot diffusers in offices, retail spaces, restaurants, condos and modern homes, along window walls, in soffits and in drop ceilings where a long, narrow air pattern looks better than a square register.
Frequently asked questions
What size diffuser does the EZLP18-3S-TB fit? It is made for a 18 inch 3-slot linear diffuser from Texas Buildmart with 3/4 in slots.
Is the box insulated? Yes. The walls are R-6 fiberglass duct board.
Does it come assembled? Yes. A knocked-down (flat) version is also available for those who prefer to build it on site.
Is the diffuser included? No. This is the plenum box only. The linear grille is sold separately.
White Paper
