BUILDMART - 18" Plenum Box for [18" Linear Slot Diffuser - 1 Slot - Single Slot] Premium Insulated Plenum Box for Heating and Cooling - Texas Buildmart

Galvanized sheet metal Plenum Box with foam insulation, ideal for Texas Buildmart 18" lineal slot diffuser. This air-distribution box attaches directly to the supply of the HVAC equipment that heats or cools the air. Connects to: 8" 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 18" Lineal Slot Diffuser - 1 Slot Galvanized sheet metal Plenum Box with foam insulation Total Box Dimensions: L: 19 1/16" W: 3" H: 11 15/16" Mouth Dimensions: L: 18" W: 1 11/16" Entry size: 8" 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   Here's a link to the Diffuser that fits this Plenum Box: 18" Linear Slot Diffuser - 1 Slot - Single Slot Linear Diffuser - Texas Buildmart - Modern AC Vent Covers for Ceilings, Walls & Floors - Commercial Grade HVAC Registers, Grilles & Vents - Home Decor & Wall Decor for Amazon Home   Here's a link to the Diffuser that fits this Plenum Box: 18" Linear Slot Diffuser - 1 Slot - Single Slot Linear Diffuser - Texas Buildmart - Modern AC Vent Covers for Ceilings, Walls & Floors - Commercial Grade HVAC Registers, Grilles & Vents - Home Decor & Wall Decor for Amazon Home