EZ Plenum EZLP12X4 Assembled Fiberglass Linear Plenum Box fits 12"-Inch 2-Slot Diffuser bearings This is a R6-rated fiberglass

This is a R6-rated fiberglass "assembled" linear plenum box that fits a 24"-inch 2-slot (1"-inch slot width) linear diffuser grille

This is a Genuine Original Equipment Manufacturer (OEM) Carrier part# HH18HA490

This is a Genuine Original Equipment Manufacturer (OEM) Carrier part# EXPXXFIL0020

This linear plenum box is shipped "knocked-down"

This is a Genuine Original Equipment Manufacturer (OEM) Carrier part# LA11AA005

EZ Plenum EZLP12X4 Assembled Fiberglass Linear Plenum Box fits 12"-Inch 2-Slot Diffuser bearings This is a R6-rated fiberglassThis is a R6 rated fiberglass "assembled" linear plenum box that fits a 12" inch 2 slot (1" inch slot width) linear diffuser grille. The standard height of our linear plenum boxes are about 12" inches high. This plenum box is manufactured to fit most 2 slot (1" inch slot width) linear grilles, however, there are exceptions therefore please see product specifications below for duct opening size and overall dimensions to confirm it will fit your brand