BUILDMART - 72" Plenum Box for [72" Linear Slot Diffuser - 2 Slot - Double Slot] Premium Insulated Plenum Box for Heating and CoolingGalvanized 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: 10" 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

Neck: 24 9/16" x 19 1/2" - Face: 26 9/16" x 21 1/2"

We recommend using a "Y" shaped splitter to supply your plenum box with an even amount of airflow through your diffuser

Connects to: 8" flexible duct in oval shape

30 x 16 30x16 16x30 16 x 30

Entry size: 9" flex in oval shape

ASIN: B09GJGC36Y

26 x 8 26x8 8x26 8 x 26

16 x 12 16x12 12x16 12 x 16

CFM: 294 ft3/min - Effective Velocity: 9

CFM: 269 ft3/min - Effective Velocity 9

ASIN: B09K5YSFBD

with reinforcement brackets on the back and a uniform coat of electrostatic paint for a sleek