Description
EZ Plenum EZLP18X4-KD 18 Inch 2-Slot Linear Plenum Box (Knocked-Down)
The EZ Plenum EZLP18X4-KD is an R-6 insulated fiberglass plenum box made to sit behind a 18 inch 2-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 knocked-down version. The box ships flat and is folded and taped into shape on site, which is how many distributors and contractors prefer to stock plenum boxes when shelf space is tight. Once assembled it matches the assembled EZLP18X4 exactly.
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 2-slot grilles. The 18-1/8 x 4-1/8 in duct opening lines up with most 18 inch 2-slot linear diffusers with 1 in slots.
Ships knocked-down. The panels arrive flat, which saves warehouse and truck space, and fold up into the finished box on site.
Standard 12 inch height. At 21 x 7 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 18-1/8 x 4-1/8 in and the box is 21 inches long, 7 inches wide and about 12 inches tall once assembled. It is built to the Metallum Enterprises 2-slot pattern and fits most 2-slot linear grilles with 1 inch 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 EZLP18X4-KD fit? It is made for a 18 inch 2-slot linear diffuser with 1 in slots.
Is the box insulated? Yes. The walls are R-6 fiberglass duct board.
Does it come assembled? No. This listing ships knocked-down (flat). An assembled version is also available as EZLP18X4.
Is the diffuser included? No. This is the plenum box only. The linear grille is sold separately.
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