BUILDMART - 72" Plenum Box for [72" Linear Slot Diffuser - 3 Slot - Triple Slot] Premium Insulated Plenum Box for Heating and Cooling - Texas Buildmart

• Galvanized sheet metal Plenum Box with foam insulation, ideal for Texas Buildmart 72" lineal slot diffuser. This air-distribution box attaches directly to the supply of the HVAC equipment that heats or cools the air. Connects to: 12" flexible duct in oval shape. Can be used and brazed to a 4" or 6" wood stud. If you do not have this size flex, you can use a reducer to modify the size. Professional HVAC Installer is Recommended.

• Ideal for Texas Buildmart 72" Lineal Slot Diffuser - 3 Slot
• Galvanized sheet metal Plenum Box with foam insulation
• Total Box Dimensions: L: 72 1/4" W: 6 3/16" H: 12 1/16"
• Mouth Dimensions: L: 71" W: 5"
• Entry size: 2 entries of 12" flex in oval shape
• This air-distribution box attaches directly to the supply of the HVAC equipment that heats or cools the air
• If you do not have this size flex, you can use a reducer to modify the size
• We recommend using a "Y" shaped splitter to supply your plenum box with an even amount of airflow through your diffuser. 
  

Here's a link to the Diffuser that fits this Plenum Box:

Here's a link to the Diffuser that fits this Plenum Box: